Kill kms server instead of sigint, fixes being stuck with pkexec

kms/client/kms_client.c

@@ -323,9 +323,7 @@ void cleanup_initial_socket(gsr_kms_client *self, bool kill_server) {
     }
 
     if(kill_server && self->kms_server_pid != -1) {
-        kill(self->kms_server_pid, SIGINT);
+        kill(self->kms_server_pid, SIGKILL);
-        int status;
-        waitpid(self->kms_server_pid, &status, 0);
         self->kms_server_pid = -1;
     }