patch 9.0.1246: code is indented more than necessary

Problem:    Code is indented more than necessary.
Solution:   Use an early return where it makes sense. (Yegappan Lakshmanan,
            closes #11887)
diff --git a/src/vim9script.c b/src/vim9script.c
index 0af7bb6..fd4658c 100644
--- a/src/vim9script.c
+++ b/src/vim9script.c
@@ -1007,42 +1007,43 @@
     // The typval is moved into the sallvar_T.
     script_hi = hash_find(script_ht, sv->sv_name);
     all_hi = hash_find(all_ht, sv->sv_name);
-    if (!HASHITEM_EMPTY(script_hi) && !HASHITEM_EMPTY(all_hi))
-    {
-	dictitem_T	*di = HI2DI(script_hi);
-	sallvar_T	*sav = HI2SAV(all_hi);
-	sallvar_T	*sav_prev = NULL;
 
-	// There can be multiple entries with the same name in different
-	// blocks, find the right one.
-	while (sav != NULL && sav->sav_var_vals_idx != idx)
-	{
-	    sav_prev = sav;
-	    sav = sav->sav_next;
-	}
-	if (sav != NULL)
-	{
-	    if (func_defined)
-	    {
-		// move the typval from the dictitem to the sallvar
-		sav->sav_tv = di->di_tv;
-		di->di_tv.v_type = VAR_UNKNOWN;
-		sav->sav_flags = di->di_flags;
-		sav->sav_di = NULL;
-		sv->sv_tv = &sav->sav_tv;
-	    }
-	    else
-	    {
-		if (sav_prev == NULL)
-		    hash_remove(all_ht, all_hi, "hide variable");
-		else
-		    sav_prev->sav_next = sav->sav_next;
-		sv->sv_name = NULL;
-		vim_free(sav);
-	    }
-	    delete_var(script_ht, script_hi);
-	}
+    if (HASHITEM_EMPTY(script_hi) || HASHITEM_EMPTY(all_hi))
+	return;
+
+    dictitem_T	*di = HI2DI(script_hi);
+    sallvar_T	*sav = HI2SAV(all_hi);
+    sallvar_T	*sav_prev = NULL;
+
+    // There can be multiple entries with the same name in different
+    // blocks, find the right one.
+    while (sav != NULL && sav->sav_var_vals_idx != idx)
+    {
+	sav_prev = sav;
+	sav = sav->sav_next;
     }
+    if (sav == NULL)
+	return;
+
+    if (func_defined)
+    {
+	// move the typval from the dictitem to the sallvar
+	sav->sav_tv = di->di_tv;
+	di->di_tv.v_type = VAR_UNKNOWN;
+	sav->sav_flags = di->di_flags;
+	sav->sav_di = NULL;
+	sv->sv_tv = &sav->sav_tv;
+    }
+    else
+    {
+	if (sav_prev == NULL)
+	    hash_remove(all_ht, all_hi, "hide variable");
+	else
+	    sav_prev->sav_next = sav->sav_next;
+	sv->sv_name = NULL;
+	vim_free(sav);
+    }
+    delete_var(script_ht, script_hi);
 }
 
 /*