[ARM] Fix ioremap.c vfree type warning

arch/arm/mm/ioremap.c:145: warning: passing argument 1 of 'vfree' makes pointer from integer without a cast

resulted from commit id 9d4ae7276ae26c5bfba6207cf05340af1931d8d4

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c
index de3ce1e..da9b359 100644
--- a/arch/arm/mm/ioremap.c
+++ b/arch/arm/mm/ioremap.c
@@ -142,7 +142,7 @@
  		return NULL;
  	addr = (unsigned long)area->addr;
  	if (remap_area_pages(addr, pfn, size, flags)) {
- 		vfree(addr);
+ 		vfree((void *)addr);
  		return NULL;
  	}
  	return (void __iomem *) (offset + (char *)addr);