leds: simatic-ipc-leds: Make simatic_ipc_led_mem_res static

simatic_ipc_led_mem_res is not used outside of the driver, make it static.

Cc: Henning Schild <henning.schild@siemens.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

drivers/leds/simple/simatic-ipc-leds.c

@@ -39,7 +39,7 @@ static struct simatic_ipc_led simatic_ipc_leds_io[] = {
 };
 
 /* the actual start will be discovered with PCI, 0 is a placeholder */
-struct resource simatic_ipc_led_mem_res = DEFINE_RES_MEM_NAMED(0, SZ_4K, KBUILD_MODNAME);
+static struct resource simatic_ipc_led_mem_res = DEFINE_RES_MEM_NAMED(0, SZ_4K, KBUILD_MODNAME);
 
 static void *simatic_ipc_led_memory;