Fix this build error:
  drivers/firmware/memmap.c:240:19: error: conflicting types for 'memmap_init'
  arch/ia64/include/asm/pgtable.h:565:17: note: previous declaration of 'memmap_init' was here
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Bernhard Walle <bwalle@suse.de>
Cc: Glauber Costa <glommer@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
  * firmware_map_add() or firmware_map_add_early() afterwards, the entries
  * are not added to sysfs.
  */
-static int __init memmap_init(void)
+static int __init firmware_memmap_init(void)
 {
        struct firmware_map_entry *entry;
 
 
        return 0;
 }
-late_initcall(memmap_init);
+late_initcall(firmware_memmap_init);