plugin-base: remove `MM_PLUGIN_SUPPORTS_PORT_IN_PROGRESS' status

Support checks are fully asynchronous and result is always reported when the
check is considered ready, so in-progress replies to
`mm_plugin_supports_port_finish()' don't make any sense.

src/mm-plugin-manager.c

@@ -269,11 +269,6 @@ supports_port_ready_cb (MMPlugin *plugin,
                                                  (GSourceFunc)find_port_support_idle,
                                                  info);
         break;
-
-    case MM_PLUGIN_SUPPORTS_PORT_IN_PROGRESS:
-        /* We have full asynchronous support, now, so we shouldn't get an
-         * intermediate state here. */
-        g_assert_not_reached ();
     }
 }
 

src/mm-plugin.h

@@ -49,7 +49,6 @@ typedef void (*MMSupportsPortResultFunc) (MMPlugin *plugin,
 
 typedef enum {
     MM_PLUGIN_SUPPORTS_PORT_UNSUPPORTED = 0x0,
-    MM_PLUGIN_SUPPORTS_PORT_IN_PROGRESS,
     MM_PLUGIN_SUPPORTS_PORT_DEFER,
     MM_PLUGIN_SUPPORTS_PORT_SUPPORTED
 } MMPluginSupportsResult;