usb:composite: clear the whole common buffer

Since the struct fsg_common is calloced, reset it completely
with zero's when reused. While at it, make checkpatch happy.

cc: Lukasz Majewski <l.majewski@samsung.com>
cc: Piotr Wilczek <p.wilczek@samsung.com>
cc: Kyungmin Park <kyungmin.park@samsung.com>
cc: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Lukasz Majewski <l.majewski@samsung.com>

drivers/usb/gadget/f_mass_storage.c

@@ -2462,12 +2462,12 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common,
 
 	/* Allocate? */
 	if (!common) {
-		common = calloc(sizeof *common, 1);
+		common = calloc(sizeof(*common), 1);
 		if (!common)
 			return ERR_PTR(-ENOMEM);
 		common->free_storage_on_release = 1;
 	} else {
-		memset(common, 0, sizeof common);
+		memset(common, 0, sizeof(*common));
 		common->free_storage_on_release = 0;
 	}