Staging: memrar: fix printk format warning

Fix printk format warning in memrar:
drivers/staging/memrar/memrar_handler.c:393: warning: format '%u' expects type 'unsigned int', but argument 4 has type 'size_t'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Ossama Othman <ossama.othman@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/memrar/memrar_handler.c

@@ -390,7 +390,7 @@ static int memrar_init_rar_resources(char const *devname)
 			(unsigned long) low,
 			(unsigned long) high);
 
-		pr_info("%s: BRAR[%d] size = %u KiB\n",
+		pr_info("%s: BRAR[%d] size = %zu KiB\n",
 			devname,
 			z,
 			rar->allocator->capacity / 1024);