Bug 891693 - Make sure that huffval gets zeroed before use. r=DRC, a=lsblakk

media/libjpeg/jdmarker.c

@@ -472,6 +472,8 @@ get_dht (j_decompress_ptr cinfo)
     for (i = 0; i < count; i++)
       INPUT_BYTE(cinfo, huffval[i], return FALSE);
 
+    MEMZERO(&huffval[count], (256 - count) * SIZEOF(UINT8));
+
     length -= count;
 
     if (index & 0x10) {		/* AC table definition */