networking: allow dot at the end of the domain name in dhcp response

Patch based on Balaji Punnuru <balaji.punnuru@gmail.com> work.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

networking/udhcp/dhcpc.c

@@ -201,6 +201,8 @@ static int good_hostname(const char *name)
 			//Do we want this?
 			//return ((name - start) < 1025); /* NS_MAXDNAME */
 		name++;
+		if (*name == '\0')
+			return 1; // We allow trailing dot too
 	}
 }
 #else