usb: gadget: Fix memleak in gadgetfs_fill_super

usb_get_gadget_udc_name will alloc memory for CHIP
in "Enomem" branch. we should free it before error
returns to prevent memleak.

Fixes: 175f712 ("usb: gadget: provide interface for legacy gadgets to get UDC name")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>

drivers/usb/gadget/legacy/inode.c

@@ -2039,6 +2039,9 @@ gadgetfs_fill_super (struct super_block *sb, struct fs_context *fc)
 	return 0;
 
 Enomem:
+	free(CHIP);
+	CHIP = NULL;
+
 	return -ENOMEM;
 }