avformat/mov: aax: pass proper AVClass to av_log()

av_log() expects its first parameter to be a pointer to a struct whose
first element is a pointer to an AVClass. In what I can only imagine is
a typo, one call to av_log() in the AAX decryption code instead passes
a pointer to an AVSHA struct, which doesn't even contain a pointer as
its first element, much less a pointer to an AVClass. Change the call to
pass the current MOVContext, as surrounding calls do.

The incorrect AVClass was causing mpv to emit the warning "av_log
callback called with bad parameters" when playing an .aax file.
Signed-off-by: Thomas Hebb <tommyhebb@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/mov.c

@@ -997,7 +997,7 @@ static int mov_read_adrm(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 
     av_log(c->fc, AV_LOG_INFO, "[aax] file checksum == "); // required by external tools
     for (i = 0; i < 20; i++)
-        av_log(sha, AV_LOG_INFO, "%02x", file_checksum[i]);
+        av_log(c->fc, AV_LOG_INFO, "%02x", file_checksum[i]);
     av_log(c->fc, AV_LOG_INFO, "\n");
 
     /* verify activation data */