Remove multiple command validation as cpuinfo requires it

"criu cpuinfo [dump | check]" can't be used through the command line as this validation kicks in.
Other commands will fail due to required arguments so I believe it's not necessary anymore.
Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

crtools.c

@@ -564,9 +564,6 @@ int main(int argc, char *argv[], char *envp[])
 			return 1;
 		memcpy(opts.exec_cmd, &argv[optind + 1], (argc - optind - 1) * sizeof(char *));
 		opts.exec_cmd[argc - optind - 1] = NULL;
-	} else if (optind + 1 != argc) {
-		pr_err("Unable to handle more than one command\n");
-		goto usage;
 	}
 
 	/* We must not open imgs dir, if service is called */