Remove unreachable code

[NE-SmallTown]

Because in nextUnitOfWork = completeWork(...), completeWork(...) will always return null, so the if (next !== null) { ... } branch is unreachable. So we can just remove it.

[sizebot]

ReactDOM: size: -0.0%, gzip: 0.0%

Details of bundled changes.

Comparing: 3c60f32...0395010

react-dom

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-dom.development.js	-0.1%	-0.0%	658.84 KB	658.45 KB	153.9 KB	153.88 KB	UMD_DEV
react-dom.production.min.js	-0.0%	0.0%	93.3 KB	93.28 KB	30.35 KB	30.35 KB	UMD_PROD
react-dom.development.js	-0.1%	-0.0%	654.17 KB	653.79 KB	152.52 KB	152.5 KB	NODE_DEV
react-dom.production.min.js	-0.0%	🔺+0.1%	93.29 KB	93.27 KB	29.92 KB	29.96 KB	NODE_PROD
ReactDOM-dev.js	-0.1%	-0.0%	671.44 KB	671.06 KB	153.24 KB	153.2 KB	FB_WWW_DEV
ReactDOM-prod.js	0.0%	-0.0%	287.27 KB	287.33 KB	52.79 KB	52.77 KB	FB_WWW_PROD
react-dom.profiling.min.js	-0.0%	-0.0%	96.29 KB	96.26 KB	30.59 KB	30.58 KB	NODE_PROFILING
ReactDOM-profiling.js	-0.1%	-0.1%	294.17 KB	294.02 KB	54.26 KB	54.2 KB	FB_WWW_PROFILING
react-dom.profiling.min.js	-0.0%	-0.0%	96.22 KB	96.19 KB	31.04 KB	31.02 KB	UMD_PROFILING

react-art

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-art.development.js	-0.1%	-0.0%	448.78 KB	448.4 KB	100.32 KB	100.3 KB	UMD_DEV
react-art.production.min.js	-0.0%	-0.1%	85.73 KB	85.71 KB	26.22 KB	26.21 KB	UMD_PROD
react-art.development.js	-0.1%	-0.0%	380.56 KB	380.17 KB	83.15 KB	83.13 KB	NODE_DEV
react-art.production.min.js	-0.0%	-0.1%	50.7 KB	50.68 KB	15.49 KB	15.48 KB	NODE_PROD
ReactART-dev.js	-0.1%	-0.0%	384.59 KB	384.2 KB	81.68 KB	81.64 KB	FB_WWW_DEV
ReactART-prod.js	-0.1%	-0.0%	163.07 KB	162.96 KB	27.4 KB	27.39 KB	FB_WWW_PROD

react-test-renderer

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-test-renderer.development.js	-0.1%	-0.0%	392.66 KB	392.28 KB	85.72 KB	85.7 KB	UMD_DEV
react-test-renderer.production.min.js	-0.0%	0.0%	51.92 KB	51.9 KB	15.77 KB	15.77 KB	UMD_PROD
react-test-renderer.development.js	-0.1%	-0.0%	388.23 KB	387.84 KB	84.59 KB	84.57 KB	NODE_DEV
react-test-renderer.production.min.js	-0.0%	0.0%	51.64 KB	51.62 KB	15.58 KB	15.58 KB	NODE_PROD
ReactTestRenderer-dev.js	-0.1%	-0.0%	392.35 KB	391.97 KB	83.39 KB	83.35 KB	FB_WWW_DEV

react-reconciler

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
react-reconciler.development.js	-0.1%	-0.0%	376.39 KB	376 KB	81.24 KB	81.21 KB	NODE_DEV
react-reconciler.production.min.js	-0.0%	-0.1%	50.39 KB	50.37 KB	15.04 KB	15.02 KB	NODE_PROD
react-reconciler-persistent.development.js	-0.1%	-0.0%	374.92 KB	374.53 KB	80.64 KB	80.61 KB	NODE_DEV
react-reconciler-persistent.production.min.js	-0.0%	-0.1%	50.4 KB	50.38 KB	15.04 KB	15.03 KB	NODE_PROD

react-native-renderer

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
ReactNativeRenderer-dev.js	-0.1%	-0.0%	508.46 KB	508.07 KB	112.18 KB	112.15 KB	RN_FB_DEV
ReactNativeRenderer-prod.js	-0.1%	-0.0%	218.17 KB	218.05 KB	37.81 KB	37.79 KB	RN_FB_PROD
ReactNativeRenderer-dev.js	-0.1%	-0.0%	508.15 KB	507.76 KB	112.1 KB	112.07 KB	RN_OSS_DEV
ReactNativeRenderer-prod.js	-0.1%	-0.0%	208.45 KB	208.33 KB	36.28 KB	36.27 KB	RN_OSS_PROD
ReactFabric-dev.js	-0.1%	-0.0%	498.6 KB	498.21 KB	109.75 KB	109.71 KB	RN_FB_DEV
ReactFabric-prod.js	-0.1%	-0.0%	200.87 KB	200.77 KB	34.8 KB	34.8 KB	RN_FB_PROD
ReactFabric-dev.js	-0.1%	-0.0%	498.63 KB	498.25 KB	109.76 KB	109.73 KB	RN_OSS_DEV
ReactFabric-prod.js	-0.1%	-0.0%	200.9 KB	200.8 KB	34.82 KB	34.81 KB	RN_OSS_PROD
ReactNativeRenderer-profiling.js	-0.2%	-0.0%	216.04 KB	215.72 KB	37.72 KB	37.71 KB	RN_OSS_PROFILING
ReactFabric-profiling.js	-0.2%	-0.1%	207.95 KB	207.58 KB	36.27 KB	36.24 KB	RN_OSS_PROFILING
ReactNativeRenderer-profiling.js	-0.1%	-0.0%	224.21 KB	223.88 KB	39.15 KB	39.14 KB	RN_FB_PROFILING
ReactFabric-profiling.js	-0.2%	-0.1%	207.91 KB	207.54 KB	36.25 KB	36.22 KB	RN_FB_PROFILING

scheduler

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
scheduler.development.js	n/a	n/a	0 B	19.17 KB	0 B	5.74 KB	UMD_DEV
scheduler.production.min.js	n/a	n/a	0 B	3.16 KB	0 B	1.53 KB	UMD_PROD

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