[media] msp3400: use IS_ENABLED check instead of #if

A recent patch broke the msp3400 driver when CONFIG_MEDIA_CONTROLLER
is not set:

drivers/media/i2c/msp3400-driver.h:107:5: error: "CONFIG_MEDIA_CONTROLLER" is not defined [-Werror=undef]

It was clearly a typo, and this patch changes the
"#if CONFIG_MEDIA_CONTROLLER" to a working IS_ENABLED() check.

Fixes: fb493282 ("[media] msp3400: initialize MC data")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/i2c/msp3400-driver.h

@@ -104,7 +104,7 @@ struct msp_state {
 	unsigned int         restart:1;
 	unsigned int         watch_stereo:1;
 
-#if CONFIG_MEDIA_CONTROLLER
+#if IS_ENABLED(CONFIG_MEDIA_CONTROLLER)
 	struct media_pad pads[IF_AUD_DEC_PAD_NUM_PADS];
 #endif
 };