usb: gadget: f_fs: remove unneeded semicolon in __ffs_data_got_descs()

Fix the following coccicheck warning:

drivers/usb/gadget/function/f_fs.c:2507:2-3: Unneeded semicolon
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

drivers/usb/gadget/function/f_fs.c

@@ -2508,7 +2508,7 @@ static int __ffs_data_got_descs(struct ffs_data *ffs,
 		os_descs_count = get_unaligned_le32(data);
 		data += 4;
 		len -= 4;
-	};
+	}
 
 	/* Read descriptors */
 	raw_descs = data;