patch 8.2.4266: compiler warning for uninitialized variable

Problem:    Compiler warning for uninitialized variable.
Solution:   Initialize saved_did_emsg.
diff --git a/src/userfunc.c b/src/userfunc.c
index f3fe493..747e4d4 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -4104,7 +4104,7 @@
 {
     int		j;
     int		c;
-    int		saved_did_emsg;
+    int		saved_did_emsg = FALSE;
     char_u	*name = name_arg;
     int		is_global = FALSE;
     char_u	*p;