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/evalfunc.c b/src/evalfunc.c
index d85e854..6335a64 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -3732,7 +3732,7 @@
     extern char		**environ;
 # endif
 
-    if (rettv_dict_alloc(rettv) != OK)
+    if (rettv_dict_alloc(rettv) == FAIL)
 	return;
 
 # ifdef MSWIN
@@ -4159,7 +4159,7 @@
 	    emsg(errormsg);
 	if (rettv->v_type == VAR_LIST)
 	{
-	    if (rettv_list_alloc(rettv) != FAIL && result != NULL)
+	    if (rettv_list_alloc(rettv) == OK && result != NULL)
 		list_append_string(rettv->vval.v_list, result, -1);
 	    vim_free(result);
 	}
@@ -4182,7 +4182,7 @@
 	    if (rettv->v_type == VAR_STRING)
 		rettv->vval.v_string = ExpandOne(&xpc, s, NULL,
 							   options, WILD_ALL);
-	    else if (rettv_list_alloc(rettv) != FAIL)
+	    else if (rettv_list_alloc(rettv) == OK)
 	    {
 		int i;
 
@@ -4784,7 +4784,7 @@
     dict_T	*d;
     int		changelistindex;
 
-    if (rettv_list_alloc(rettv) != OK)
+    if (rettv_list_alloc(rettv) == FAIL)
 	return;
 
     if (in_vim9script() && check_for_opt_buffer_arg(argvars, 0) == FAIL)
@@ -4929,7 +4929,7 @@
     static void
 f_getcharsearch(typval_T *argvars UNUSED, typval_T *rettv)
 {
-    if (rettv_dict_alloc(rettv) != FAIL)
+    if (rettv_dict_alloc(rettv) == OK)
     {
 	dict_T *dict = rettv->vval.v_dict;
 
@@ -5016,7 +5016,7 @@
     list_T	*l;
     dict_T	*d;
 
-    if (rettv_list_alloc(rettv) != OK)
+    if (rettv_list_alloc(rettv) == FAIL)
 	return;
 
     if (in_vim9script()
@@ -5221,7 +5221,7 @@
 {
     win_T	*wp = curwin;			// default is current window
 
-    if (rettv_dict_alloc(rettv) != OK)
+    if (rettv_dict_alloc(rettv) == FAIL)
 	return;
 
     if (in_vim9script() && check_for_opt_number_arg(argvars, 0) == FAIL)
@@ -7844,7 +7844,7 @@
     static void
 f_pum_getpos(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
 {
-    if (rettv_dict_alloc(rettv) != OK)
+    if (rettv_dict_alloc(rettv) == FAIL)
 	return;
     pum_set_event_info(rettv->vval.v_dict);
 }
@@ -8133,7 +8133,7 @@
     varnumber_T	stride = 1;
     int		error = FALSE;
 
-    if (rettv_list_alloc(rettv) != OK)
+    if (rettv_list_alloc(rettv) == FAIL)
 	return;
 
     if (in_vim9script()
@@ -10197,7 +10197,7 @@
 
     CLEAR_FIELD(str);
 
-    if (rettv_list_alloc(rettv) != FAIL)
+    if (rettv_list_alloc(rettv) == OK)
     {
 	if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count
 	    && col >= 0 && col <= (long)STRLEN(ml_get(lnum))
@@ -10258,7 +10258,7 @@
 
     if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count
 	    && col >= 0 && col <= (long)STRLEN(ml_get(lnum))
-	    && rettv_list_alloc(rettv) != FAIL)
+	    && rettv_list_alloc(rettv) == OK)
     {
 	(void)syn_get_id(curwin, lnum, col, FALSE, NULL, TRUE);
 	for (i = 0; ; ++i)
@@ -10293,7 +10293,7 @@
 	if (tp != NULL)
 	    wp = (tp == curtab) ? firstwin : tp->tp_firstwin;
     }
-    if (wp != NULL && rettv_list_alloc(rettv) != FAIL)
+    if (wp != NULL && rettv_list_alloc(rettv) == OK)
     {
 	for (; wp != NULL; wp = wp->w_next)
 	    if (list_append_number(rettv->vval.v_list,