avcodec/utils: av_lockmgr_register defines behavior on failure.
The register function now specifies that the user callback should
leave things in the same state that it found them on failure but
that failure to destroy is ignored by the library. The register
function is now explicit about its behavior on failure
(it unregisters the previous callback and destroys all mutex).
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>
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