Fix memory leak in ubpf_exec (#306) #982

Job	Run time
linux_debug_coverage / build	1m 22s
linux_debug_arm64 / build	2m 2s
linux_debug / build	1m 10s
linux_debug_arm64_coverage / build	2m 50s
linux_debug_sanitizers / build	1m 49s
linux_release / build	1m 2s
linux_release_arm64_coverage / build	2m 1s
linux_release_arm64 / build	2m 21s
linux_release_coverage / build	1m 3s
linux_release_sanitizers / build	1m 25s
linux_release_scan_build / build	1m 26s
macos_debug / build	3m 36s
macos_debug_sanitizers / build	4m 24s
macos_debug_coverage / build	3m 15s
macos_release / build	3m 21s
macos_release_coverage / build	3m 28s
windows_debug / build	4m 12s
macos_release_sanitizers / build	4m 38s
windows_release / build	6m 53s
finish	0s
	52m 18s

Provide feedback