module: Remove double spaces in module verification taint message

The warning message when loading modules with a wrong signature has
two spaces in it:

"module verification failed: signature and/or  required key missing"
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>

kernel/module.c

@@ -3265,7 +3265,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
 	mod->sig_ok = info->sig_ok;
 	if (!mod->sig_ok) {
 		pr_notice_once("%s: module verification failed: signature "
-			       "and/or  required key missing - tainting "
+			       "and/or required key missing - tainting "
 			       "kernel\n", mod->name);
 		add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK);
 	}