[x264-devel] [patch] Fix memoryleaks on some functions fail situations

[BugMaster]

Free resourses allocated by some functions (x264_encoder_open,
x264_ratecontrol_new, etc.) when they fail. Doesn't important for CLI
version of encoder but can be useful when x264 used as library.

Patch need recheck because I don't test all situations and may be some
simplification by macroses because there are a lot of repeated code.
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