Make code better readable.

Patch by Ladislav Michl, 14 Sep 2005

CHANGELOG

@@ -2,6 +2,9 @@
 Changes since U-Boot 1.1.4:
 ======================================================================
 
+* Make code better readable.
+  Patch by Ladislav Michl, 14 Sep 2005
+
 * Enable initrd ATAG for xm250 board.
   Patch by Josef Wagner, 05 Sep 2005
   

common/cmd_mem.c

@@ -707,7 +707,7 @@ int do_mem_mtest (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 #if defined(CFG_MEMTEST_SCRATCH)
 	vu_long *dummy = (vu_long*)CFG_MEMTEST_SCRATCH;
 #else
-	vu_long *dummy = NULL;
+	vu_long *dummy = 0;	/* yes, this is address 0x0, not NULL */
 #endif
 	int	j;
 	int iterations = 1;