net engine: accept both upper and lowercase tcp/udp.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/engines/net.c b/engines/net.c
index 2a9caaa..8dbc2a8 100644
--- a/engines/net.c
+++ b/engines/net.c
@@ -452,9 +452,11 @@
 		goto bad_host;
 
 	if (modep) {
-		if (!strncmp("tcp", modep, strlen(modep)))
+		if (!strncmp("tcp", modep, strlen(modep)) ||
+		    !strncmp("TCP", modep, strlen(modep)))
 			nd->net_protocol = IPPROTO_TCP;
-		else if (!strncmp("udp", modep, strlen(modep)))
+		else if (!strncmp("udp", modep, strlen(modep)) ||
+			 !strncmp("UDP", modep, strlen(modep)))
 			nd->net_protocol = IPPROTO_UDP;
 		else
 			goto bad_host;