patch 8.2.2333: Vim9: warning for uninitialized variable

Problem:    Vim9: warning for uninitialized variable. (Tony Mechelynck)
Solution:   Initialize "res".
diff --git a/src/version.c b/src/version.c
index 464154f..390c1f9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2333,
+/**/
     2332,
 /**/
     2331,
diff --git a/src/vim9execute.c b/src/vim9execute.c
index be06d89..7c4ef2a 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -754,7 +754,7 @@
     int		argcount = argcount_arg;
     char_u	*name = NULL;
     int		called_emsg_before = called_emsg;
-    int		res;
+    int		res = FAIL;
 
     if (tv->v_type == VAR_PARTIAL)
     {
@@ -800,7 +800,7 @@
 	vim_free(tofree);
     }
 
-    if (name == NULL || res == FAIL)
+    if (res == FAIL)
     {
 	if (called_emsg == called_emsg_before)
 	    semsg(_(e_unknownfunc),