kconfig: don't emit warning upon rootmenu's prompt redefinition

This silences the warning printed upon prompt redefinition for the rootmenu.
We will encounter this redefinition when a "mainmenu" statement is specified and
override the default prompt.

Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Michal Marek <mmarek@suse.cz>
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 682045a..23acbdb 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -139,7 +139,7 @@
 			while (isspace(*prompt))
 				prompt++;
 		}
-		if (current_entry->prompt)
+		if (current_entry->prompt && current_entry != &rootmenu)
 			prop_warn(prop, "prompt redefined");
 		current_entry->prompt = prop;
 	}