avfilter/vf_paletteuse: Fix potential double-free of AVFrame

apply_palette() would free an AVFrame given to it only via an AVFrame *
(and not via AVFrame **) in three of its four exists (namely in the
normal path and in two error paths). So upon error the caller has no way
to know whether the frame has already been freed or not;
load_apply_palette(), the only caller, opted to free the frame in this
scenario.

This commit changes this by making apply_palette not freeing the frame
at all, which is left to load_apply_palette().

Fixes Coverity issue #1452434.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit adea33f465)

libavfilter/vf_paletteuse.c

@@ -903,7 +903,6 @@ static int apply_palette(AVFilterLink *inlink, AVFrame *in, AVFrame **outf)
 
     AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     if (!out) {
-        av_frame_free(&in);
         *outf = NULL;
         return AVERROR(ENOMEM);
     }
@@ -916,7 +915,6 @@ static int apply_palette(AVFilterLink *inlink, AVFrame *in, AVFrame **outf)
     if (av_frame_ref(s->last_in, in) < 0 ||
         av_frame_ref(s->last_out, out) < 0 ||
         av_frame_make_writable(s->last_in) < 0) {
-        av_frame_free(&in);
         av_frame_free(&out);
         *outf = NULL;
         return AVERROR(ENOMEM);
@@ -934,7 +932,6 @@ static int apply_palette(AVFilterLink *inlink, AVFrame *in, AVFrame **outf)
     memcpy(out->data[1], s->palette, AVPALETTE_SIZE);
     if (s->calc_mean_err)
         debug_mean_error(s, in, out, inlink->frame_count_out);
-    av_frame_free(&in);
     *outf = out;
     return 0;
 }
@@ -1023,20 +1020,17 @@ static int load_apply_palette(FFFrameSync *fs)
     if (ret < 0)
         return ret;
     if (!master || !second) {
-        ret = AVERROR_BUG;
-        goto error;
+        av_frame_free(&master);
+        return AVERROR_BUG;
     }
     if (!s->palette_loaded) {
         load_palette(s, second);
     }
     ret = apply_palette(inlink, master, &out);
+    av_frame_free(&master);
     if (ret < 0)
-        goto error;
+        return ret;
     return ff_filter_frame(ctx->outputs[0], out);
-
-error:
-    av_frame_free(&master);
-    return ret;
 }
 
 #define DEFINE_SET_FRAME(color_search, name, value)                             \