x86: mm/init_32.c fix compilation warning

 arch/x86/mm/init_32.c: In function ‘find_low_pfn_range’:
 arch/x86/mm/init_32.c:696: warning: format ‘%u’ expects type ‘unsigned int’, but
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/mm/init_32.c

@@ -692,7 +692,7 @@ void __init find_low_pfn_range(void)
 			max_pfn = MAXMEM_PFN + highmem_pages;
 		if (highmem_pages + MAXMEM_PFN > max_pfn) {
 			printk(KERN_WARNING "only %luMB highmem pages "
-				"available, ignoring highmem size of %uMB.\n",
+				"available, ignoring highmem size of %luMB.\n",
 				pages_to_mb(max_pfn - MAXMEM_PFN),
 				pages_to_mb(highmem_pages));
 			highmem_pages = 0;