net: Fix memcpy_toiovecend() to use the right offset

Increment the iovec base by the offset passed in for the initial
copy_to_user() in memcpy_to_iovecend().

Signed-off-by: Sridhar Samudrala <[e-mail]>
Acked-by: Michael S. Tsirkin <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/core/iovec.c

···
 			continue;
 		}
 		copy = min_t(unsigned int, iov->iov_len - offset, len);
-		offset = 0;
-		if (copy_to_user(iov->iov_base, kdata, copy))
+		if (copy_to_user(iov->iov_base + offset, kdata, copy))
 			return -EFAULT;
+		offset = 0;
 		kdata += copy;
 		len -= copy;
 	}