Fix potential soft-lock in test video player. #431

Job	Run time
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	13m 24s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	13m 21s
Build windows-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	13m 25s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	13m 28s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=libretro	13m 28s
Build windows-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	13m 4s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=GLFW	13m 26s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=libretro	13m 27s
Build ubuntu-latest \|\| SHARED=OFF \|\| PLATFORM=KHR_DISPLAY	13m 26s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=GLFW	13m 26s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=libretro	13m 27s
Build ubuntu-latest \|\| SHARED=ON \|\| PLATFORM=KHR_DISPLAY	13m 26s
	2h 40m 48s

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