doc/examples: fix assignments in if()

Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

doc/examples/demuxing.c

@@ -314,7 +314,7 @@ int main (int argc, char **argv)
     if (audio_stream) {
         const char *fmt;
 
-        if ((ret = get_format_from_sample_fmt(&fmt, audio_dec_ctx->sample_fmt) < 0))
+        if ((ret = get_format_from_sample_fmt(&fmt, audio_dec_ctx->sample_fmt)) < 0)
             goto end;
         printf("Play the output audio file with the command:\n"
                "ffplay -f %s -ac %d -ar %d %s\n",

doc/examples/resampling_audio.c

@@ -200,7 +200,7 @@ int main(int argc, char **argv)
         fwrite(dst_data[0], 1, dst_bufsize, dst_file);
     } while (t < 10);
 
-    if ((ret = get_format_from_sample_fmt(&fmt, dst_sample_fmt) < 0))
+    if ((ret = get_format_from_sample_fmt(&fmt, dst_sample_fmt)) < 0)
         goto end;
     fprintf(stderr, "Resampling succeeded. Play the output file with the command:\n"
             "ffplay -f %s -channel_layout %"PRId64" -channels %d -ar %d %s\n",