Fix one more place uio_resid is truncated to int

A follow-up to r231949 and r194990.

Reported by:	pho@
Reviewed by:	kib@, markj@
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D11373

sys/kern/uipc_mbuf.c

@@ -1517,7 +1517,7 @@ m_uiotombuf(struct uio *uio, int how, int len, int align, int flags)
 	 * the total data supplied by the uio.
 	 */
 	if (len > 0)
-		total = min(uio->uio_resid, len);
+		total = (uio->uio_resid < len) ? uio->uio_resid : len;
 	else
 		total = uio->uio_resid;