x86: fix uninitialized variable in init_memory_mapping()

Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi>
LKML-Reference: <1236265466.31324.9.camel@penberg-laptop>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/mm/init.c

@@ -134,8 +134,8 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
 {
 	unsigned long page_size_mask = 0;
 	unsigned long start_pfn, end_pfn;
+	unsigned long ret = 0;
 	unsigned long pos;
-	unsigned long ret;
 
 	struct map_range mr[NR_RANGE_MR];
 	int nr_range, i;