[FFmpeg-trac] #6878(undetermined:new): Error compiling libvmaf filter in MinGW

[FFmpeg]

#6878: Error compiling libvmaf filter in MinGW
-------------------------------------+-------------------------------------
             Reporter:  Gyan         |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Compiling libvmaf filter fails on Windows using GCC 6.3.0 on MinGW64

 {{{

 CC      libavfilter/vf_libvmaf.o
 libavfilter/vf_libvmaf.c: In function 'call_vmaf':
 libavfilter/vf_libvmaf.c:173:1: error: no return statement in function
 returning non-void [-Werror=return-type]
 }}}

 Existing function body is


 {{{
  static void *call_vmaf(void *ctx)
 {
     LIBVMAFContext *s = (LIBVMAFContext *) ctx;
     compute_vmaf_score(s);
     av_log(ctx, AV_LOG_INFO, "VMAF score: %f\n",s->vmaf_score);
     pthread_exit(NULL);
 }
 }}}

 Adding `return NULL;` results in successful compilation.

 `-Werror=return-type` is set in configure so I assume that shouldn't be
 changed.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6878>
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