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opusenc: Ignore null comments from FLAC input

Crash found by afl-fuzz.

--- a/src/flac.c

+++ b/src/flac.c

@@ -125,6 +125,7 @@

           char *entry;

           char *end;

           entry=(char *)comments[i].entry;

+          if(!entry)continue;

           /*Check for ReplayGain tags.

             Parse the ones we have R128 equivalents for, and skip the others.*/

           if(oi_strncasecmp(entry,"REPLAYGAIN_REFERENCE_LOUDNESS=",30)==0){