Author: Monty <paranoia@xiph.org>
Description:
 Changeset 15356: Fix a really stupid oversight that should have been tested:
 forcing a drive/host endian mismatch within the interface lib.
 Does not check for null buff before trying a byteswap
 (Closes: #499716, #506337, #507795, #509762).

--- a/interface/interface.c
+++ b/interface/interface.c
@@ -118,7 +118,7 @@
 	if(d->bigendianp==-1) /* not determined yet */
 	  d->bigendianp=data_bigendianp(d);
 	
-	if(d->bigendianp!=bigendianp()){
+	if(buffer && d->bigendianp!=bigendianp()){
 	  int i;
 	  u_int16_t *p=(u_int16_t *)buffer;
 	  long els=sectors*CD_FRAMESIZE_RAW/2;