MN10300: BUG to BUG_ON changes

Signed-off-by: Stoyan Gaydarov <stoyboyker@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/arch/mn10300/mm/init.c b/arch/mn10300/mm/init.c
index 6e6bc0e..f86c283 100644
--- a/arch/mn10300/mm/init.c
+++ b/arch/mn10300/mm/init.c
@@ -84,8 +84,7 @@
 	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)