patch 7.4.1322

Problem:    Crash when unletting the variable that holds the channel in a
            callback function.  (Christian Robinson)
Solution:   Increase the reference count while invoking the callback.

src/version.c

@@ -747,6 +747,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1322,
 /**/
     1321,
 /**/