patch 8.2.3460: some type casts are not needed

Problem:    Some type casts are not needed.
Solution:   Remove unnecessary type casts. (closes #8934)
diff --git a/src/autocmd.c b/src/autocmd.c
index a721e70..bd1ed87 100644
--- a/src/autocmd.c
+++ b/src/autocmd.c
@@ -386,7 +386,7 @@
 	return;
 
     // loop over all events
-    for (event = (event_T)0; (int)event < (int)NUM_EVENTS;
+    for (event = (event_T)0; (int)event < NUM_EVENTS;
 					    event = (event_T)((int)event + 1))
     {
 	// loop over all autocommand patterns
@@ -460,7 +460,7 @@
 	    apc->arg_bufnr = 0;
 
     // invalidate buflocals looping through events
-    for (event = (event_T)0; (int)event < (int)NUM_EVENTS;
+    for (event = (event_T)0; (int)event < NUM_EVENTS;
 					    event = (event_T)((int)event + 1))
 	// loop over all autocommand patterns
 	FOR_ALL_AUTOCMD_PATTERNS(event, ap)
@@ -523,7 +523,7 @@
 	AutoPat	*ap;
 	int	in_use = FALSE;
 
-	for (event = (event_T)0; (int)event < (int)NUM_EVENTS;
+	for (event = (event_T)0; (int)event < NUM_EVENTS;
 					    event = (event_T)((int)event + 1))
 	{
 	    FOR_ALL_AUTOCMD_PATTERNS(event, ap)
@@ -695,7 +695,7 @@
     {
 	for (pat = arg; *pat && *pat != '|' && !VIM_ISWHITE(*pat); pat = p)
 	{
-	    if ((int)event_name2nr(pat, &p) >= (int)NUM_EVENTS)
+	    if ((int)event_name2nr(pat, &p) >= NUM_EVENTS)
 	    {
 		if (have_group)
 		    semsg(_("E216: No such event: %s"), pat);
@@ -967,7 +967,7 @@
 	if (!forceit && *cmd != NUL)
 	    emsg(_(e_cannot_define_autocommands_for_all_events));
 	else
-	    for (event = (event_T)0; (int)event < (int)NUM_EVENTS;
+	    for (event = (event_T)0; (int)event < NUM_EVENTS;
 					     event = (event_T)((int)event + 1))
 		if (do_autocmd_event(event, pat,
 			     once, nested, cmd, forceit, group, flags) == FAIL)