MIH: fix fix spelling typo found by lintian

Change-Id: Ie8000bfaf086582f36dd88a06cb0b01e0a377096
Reviewed-on: https://code.wireshark.org/review/18524
Reviewed-by: Anders Broman <a.broman58@gmail.com>

epan/dissectors/packet-mih.c

@@ -699,7 +699,7 @@ static const value_string reg_request_code_vals[] = {
 };
 
 static const value_string ip_renewal_vals[] = {
-{0, "Change Not Requiered"},
+{0, "Change Not Required"},
 {1, "Change Required"},
 {0, NULL}
 };