--- ray/src/common/malloc.c	1995/10/24 09:45:07	2.9
+++ ray/src/common/malloc.c	1998/08/24 15:31:29	2.11
@@ -27,7 +27,6 @@ static char SCCSid[] = "$SunId$ LBL";
 #ifndef  BSD
 #define  bcopy(s,d,n)		(void)memcpy(d,s,n)
 #define  bzero(d,n)		(void)memset(d,0,n)
-extern char  *memcpy(), *memset();
 #endif
 
 #ifdef MSTATS
@@ -304,7 +303,7 @@ register unsigned  n;
 	register int	bucket;
 	register unsigned	bsiz;
 
-	if (n < 1<<FIRSTBUCKET)
+	if (n < 1<<FIRSTBUCKET || p == NULL)
 		return;
 #ifdef MSTATS
 	b_nfreed += n;