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/job.c b/src/job.c
index 7cce611..7dbfc7d 100644
--- a/src/job.c
+++ b/src/job.c
@@ -1893,7 +1893,7 @@
 	job_T	*job;
 
 	job = get_job_arg(&argvars[0]);
-	if (job != NULL && rettv_dict_alloc(rettv) != FAIL)
+	if (job != NULL && rettv_dict_alloc(rettv) == OK)
 	    job_info(job, rettv->vval.v_dict);
     }
     else if (rettv_list_alloc(rettv) == OK)