When using -p <module name> (or --module <module name>) to look for help, also...

When using -p <module name> (or --module <module name>) to look for help, also check if the module name matches a module's shortcut (and not only the main name). Makes it possible to use stuff like vlc -p udp instead of vlc -p access_udp.

src/libvlc-common.c

@@ -1319,6 +1319,14 @@ static void Usage( libvlc_int_t *p_this, char const *psz_module_name )
         if( psz_module_name && strcmp( psz_module_name,
                                        p_parser->psz_object_name ) )
         {
+            char **pp_shortcut = p_parser->pp_shortcuts;
+            while( *pp_shortcut )
+            {
+                if( !strcmp( psz_module_name, *pp_shortcut ) )
+                    break;
+                pp_shortcut ++;
+            }
+            if( !*pp_shortcut )
                 continue;
         }