mgcp_msg: add trunk parameter to mgcp_check_param for logging

There is not always an endp pointer present when mgcp_check_param() is
called but we always have a trunk pointer. Lets add a trunk parameter so
that the function can pick LOGPTRUNK when endp is not available.

Change-Id: I7327c5a105e7f0e20cabf64623ff9f36fd83bbb8
Related: SYS#5535
diff --git a/src/libosmo-mgcp/mgcp_protocol.c b/src/libosmo-mgcp/mgcp_protocol.c
index b7ae748..ef82cfd 100644
--- a/src/libosmo-mgcp/mgcp_protocol.c
+++ b/src/libosmo-mgcp/mgcp_protocol.c
@@ -851,7 +851,7 @@
 
 	/* parse CallID C: and LocalParameters L: */
 	for_each_line(line, pdata->save) {
-		if (!mgcp_check_param(endp, line))
+		if (!mgcp_check_param(endp, trunk, line))
 			continue;
 
 		switch (toupper(line[0])) {
@@ -1143,7 +1143,7 @@
 	}
 
 	for_each_line(line, pdata->save) {
-		if (!mgcp_check_param(endp, line))
+		if (!mgcp_check_param(endp, trunk, line))
 			continue;
 
 		switch (toupper(line[0])) {
@@ -1388,7 +1388,7 @@
 	}
 
 	for_each_line(line, pdata->save) {
-		if (!mgcp_check_param(endp, line))
+		if (!mgcp_check_param(endp, trunk, line))
 			continue;
 
 		switch (toupper(line[0])) {