Merge branch 'enotsock' into 'master'

GIO: Convert ENOTSOCK to G_IO_ERROR_INVALID_ARGUMENT

Closes #1728

See merge request GNOME/glib!731

gio/gioerror.c

@@ -272,6 +272,12 @@ g_io_error_from_errno (gint err_no)
       break;
 #endif
 
+#ifdef ENOTSOCK
+    case ENOTSOCK:
+      return G_IO_ERROR_INVALID_ARGUMENT;
+      break;
+#endif
+
     default:
       return G_IO_ERROR_FAILED;
       break;