cleanup assert with failing chroma conversion
sample from #28311 (closed) vout=xcb
[00007feed0002000] blend blend error: no matching alpha blending routine (chroma: RGBA -> RGBP)
[00007feed0002000] main blend error: blending RGBA to RGBP failed#0 0x00007f26e2a75844 in __pthread_kill_implementation () at /lib64/libc.so.6
#1 0x00007f26e2a24abe in raise () at /lib64/libc.so.6
#2 0x00007f26e2a0d87f in abort () at /lib64/libc.so.6
#3 0x00007f26e2a0e60f in _IO_peekc_locked.cold () at /lib64/libc.so.6
#4 0x00007f26e2a7f775 in () at /lib64/libc.so.6
#5 0x00007f26e2a81940 in _int_free () at /lib64/libc.so.6
#6 0x00007f26e2a841ce in free () at /lib64/libc.so.6
#7 0x00007f26e2dbbc18 in video_format_Clean (p_src=0x7f26501442a8) at ../../vlc/include/vlc_es.h:483
#8 vout_display_Delete (vd=0x7f2650144150) at ../../vlc/src/video_output/display.c:777
#9 0x00007f26e2dcea67 in vout_CloseWrapper (vout=<optimized out>, sys=<optimized out>, vd=<optimized out>) at ../../vlc/src/video_output/vout_wrapper.c:146
#10 0x00007f26e2dbd27c in vout_ReleaseDisplay (vout=vout@entry=0x7f2650086000) at ../../vlc/src/video_output/video_output.c:1836
#11 0x00007f26e2dc0fd2 in vout_StopDisplay (vout=vout@entry=0x7f2650086000) at ../../vlc/src/video_output/video_output.c:1887
#12 0x00007f26e2da7dd8 in input_resource_PutVoutLocked (p_resource=0x225bdc0, vout=<optimized out>, vout_state=<optimized out>) at ../../vlc/src/input/resource.c:376
#13 0x00007f26e2da846d in input_resource_PutVout (p_resource=0x225bdc0, vout=vout@entry=0x7f2650086000, vout_state=vout_state@entry=0x7f26981fe9e4) at ../../vlc/src/input/resource.c:405
#14 0x00007f26e2d7a5ec in DeleteDecoder (p_owner=0x7f264cc0a940, i_cat=<optimized out>) at ../../vlc/src/input/decoder.c:2050
#15 0x00007f26e2d7e06f in vlc_input_decoder_Delete (p_owner=<optimized out>) at ../../vlc/src/input/decoder.c:2227
#16 0x00007f26e2d824a0 in EsOutDestroyDecoder (p_es=p_es@entry=0x7f264cc03ba0, out=0x22b7c08) at ../../vlc/src/input/es_out.c:2361
#17 0x00007f26e2d87e92 in EsOutUnselectEs (out=out@entry=0x22b7c08, es=es@entry=0x7f264cc03ba0, b_update=<optimized out>) at ../../vlc/src/input/es_out.c:2534
#18 0x00007f26e2d853a4 in EsOutVaPrivControlLocked (out=out@entry=0x22b7c08, source=<optimized out>, source@entry=0x0, query=query@entry=65536, args=args@entry=0x7f26981feb50) at ../../vlc/src/input/es_out.c:3733
#19 0x00007f26e2d86c14 in EsOutPrivControl (out=0x22b7c08, source=0x0, query=65536, args=0x7f26981feb50) at ../../vlc/src/input/es_out.c:4043
#20 0x00007f26e2d8c7a0 in es_out_in_vaPrivControl (args=0x7f26981feb50, i_query=<optimized out>, in=<optimized out>, p_out=<optimized out>) at ../../vlc/src/input/es_out_timeshift.c:464
#21 es_out_in_PrivControl (p_out=<optimized out>, in=<optimized out>, i_query=<optimized out>) at ../../vlc/src/input/es_out_timeshift.c:474
#22 0x00007f26e2d8dbec in PrivControlLocked (args=<optimized out>, i_query=<optimized out>, in=<optimized out>, p_tsout=0x7f264c000d88) at ../../vlc/src/input/es_out_timeshift.c:758
#23 PrivControl (p_tsout=0x7f264c000d88, in=<optimized out>, i_query=<optimized out>, args=<optimized out>) at ../../vlc/src/input/es_out_timeshift.c:817
#24 0x00007f26e2d8f601 in es_out_vaPrivControl (args=0x7f26981fecc0, query=65536, out=<optimized out>) at ../../vlc/src/input/es_out.h:105
#25 es_out_PrivControl (out=<optimized out>, query=query@entry=65536) at ../../vlc/src/input/es_out.h:112
#26 0x00007f26e2d96ff5 in es_out_SetMode (i_mode=0, p_out=<optimized out>) at ../../vlc/src/input/es_out.h:119
#27 End (p_input=p_input@entry=0x22b44a0) at ../../vlc/src/input/input.c:1404
#28 0x00007f26e2d97305 in Run (data=0x22b44a0) at ../../vlc/src/input/input.c:431
#29 0x00007f26e2a73907 in start_thread () at /lib64/libc.so.6
#30 0x00007f26e2af9870 in clone3 () at /lib64/libc.so.6