MN10300: BUG to BUG_ON changes

Signed-off-by: Stoyan Gaydarov <stoyboyker@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>

arch/mn10300/mm/init.c

@@ -84,8 +84,7 @@ void __init mem_init(void)
 	int codesize, reservedpages, datasize, initsize;
 	int tmp;
 
-	if (!mem_map)
-		BUG();
+	BUG_ON(!mem_map);
 
 #define START_PFN	(contig_page_data.bdata->node_min_pfn)
 #define MAX_LOW_PFN	(contig_page_data.bdata->node_low_pfn)