patch 8.1.1386: unessesary type casts for lalloc()

Problem:    Unessesary type casts for lalloc().
Solution:   Remove type casts.  Change lalloc(size, TRUE) to alloc(size).
diff --git a/src/menu.c b/src/menu.c
index 1ff45b9..f32fe49 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -583,7 +583,7 @@
 	    }
 
 	    /* Not already there, so lets add it */
-	    menu = (vimmenu_T *)alloc_clear((unsigned)sizeof(vimmenu_T));
+	    menu = (vimmenu_T *)alloc_clear(sizeof(vimmenu_T));
 	    if (menu == NULL)
 		goto erret;