init: pedantic correction to "can't exec" script warning

Direct /etc/rc exec was introduced in r337321, with a fallback to
passing it to sh if direct exec fails.  "Can't exec" is slightly
misleading in this case (the script is still executed, just not
directly).

sbin/init/init.c

@@ -1083,7 +1083,7 @@ execute_script(char *argv[])
 	error = access(script, X_OK);
 	if (error == 0) {
 		execv(script, argv + 1);
-		warning("can't exec %s: %m", script);
+		warning("can't directly exec %s: %m", script);
 	} else if (errno != EACCES) {
 		warning("can't access %s: %m", script);
 	}