mgcp_parse_audio_port_pt(): fix buffer overflow

Change-Id: I18c78d15eb1593f404b4741248225b68878b463f
diff --git a/src/libosmo-mgcp-client/mgcp_client.c b/src/libosmo-mgcp-client/mgcp_client.c
index 5df4560..b5897a6 100644
--- a/src/libosmo-mgcp-client/mgcp_client.c
+++ b/src/libosmo-mgcp-client/mgcp_client.c
@@ -319,7 +319,7 @@
 	pt_str = strtok(line, " ");
 	while (1) {
 		/* Do not allow excessive payload types */
-		if (count > ARRAY_SIZE(r->codecs))
+		if (count >= ARRAY_SIZE(r->codecs))
 			goto response_parse_failure_pt;
 
 		pt_str = strtok(NULL, " ");