Fix potential nil pointer problem

[life1347]

Fix potential nil pointer problem when both watchResources and waitForBuild are equal to false.
I moved L431 out of if condition, it's more clean and easy to understand.

fission/fission/spec.go

Lines 427 to 433 in fe9453a

	var ctx context.Context
	var pkgWatchCancel context.CancelFunc
	if watchResources || waitForBuild {
	// watch package builds
	ctx, pkgWatchCancel = context.WithCancel(context.Background())
	pbw.addPackages(pkgMetas)
	}

fission/fission/spec.go

Lines 443 to 446 in fe9453a

	if !watchResources {
	pkgWatchCancel()
	break
	}

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This change is 

[soamvasani]

LGTM, thanks, this is much better than my version.