Make the array be long enough, otherwise strncpy() on some platforms

will clobber it (e.g., FC4 which will pad the end of the string with
\0's).

This commit was SVN r8656.

opal/util/if.c

@@ -637,7 +637,7 @@ int opal_ifindextoname(int if_index, char* if_name, int length)
 bool
 opal_ifislocal(char *hostname)
 {
-    char addrname[ADDRLEN - 1];
+    char addrname[ADDRLEN + 1];
     int ret;
     struct hostent *h;