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libs: videopool: fix undocumented behavior and counting

Víctor Manuel Jáquez Leal requested to merge vjaquez/gstreamer-vaapi:videopool-fix into master

This is a (modified) cherry-pick of !100 (closed)

CC: @He_Junyan

gst_vaapi_video_pool_reserve_unlocked() hit an undocumented behavoir because it locks twice the same mutex.

Also, n had different meanings in the current code: as an increase value and as a new total of allocated surfaces.

This patche removes the undocumented behavoir (usually a deadlock) and fixes the meaning of n as the new total of allocated surfaces.

Signed-off-by: Víctor Manuel Jáquez Leal vjaquez@igalia.com

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