patch 8.2.5107: some callers of rettv_list_alloc() check for not OK

Problem:    Some callers of rettv_list_alloc() check for not OK. (Christ van
            Willegen)
Solution:   Use "==" instead of "!=" when checking the return value.
diff --git a/src/move.c b/src/move.c
index 5c78d6c..5865af8 100644
--- a/src/move.c
+++ b/src/move.c
@@ -1298,7 +1298,7 @@
     int		row = 0;
     int		scol = 0, ccol = 0, ecol = 0;
 
-    if (rettv_dict_alloc(rettv) != OK)
+    if (rettv_dict_alloc(rettv) == FAIL)
 	return;
     dict = rettv->vval.v_dict;