As Jeff pointed out, the reqd flag should only turn off the show_help - still enter the rest of the code block

Refs trac:4019

This commit was SVN r30091.

The following Trac tickets were found above:
  Ticket 4019 --> https://svn.open-mpi.org/trac/ompi/ticket/4019

ompi/mca/btl/tcp/btl_tcp_component.c

@@ -571,10 +571,12 @@ static char **split_and_resolve(char **orig_str, char *name, bool reqd)
         }
         
         /* If we didn't find a match, keep trying */
-        if (if_index < 0 && reqd) {
-            opal_show_help("help-mpi-btl-tcp.txt", "invalid if_inexclude",
-                           true, name, ompi_process_info.nodename, tmp,
-                           "Did not find interface matching this subnet");
+        if (if_index < 0) {
+            if (reqd) {
+                opal_show_help("help-mpi-btl-tcp.txt", "invalid if_inexclude",
+                               true, name, ompi_process_info.nodename, tmp,
+                               "Did not find interface matching this subnet");
+            }
             free(tmp);
             continue;
         }