x86: replace the now useless max_pfn_mapped define

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 210243e..ef9e9cf 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -791,7 +791,7 @@
 		 * This can happen with kdump kernels when accessing
 		 * firmware tables:
 		 */
-		if (pfn < end_pfn_map)
+		if (pfn < max_pfn_mapped)
 			return;
 
 		printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n",