command: return 1 on unknown command

hush now prints the error value if a command returns a value < 0,
so do not return -1 (EPERM) when we encounter an unknown command.
Instead, return 1 so that hush is quiet.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

common/command.c

@@ -85,7 +85,7 @@ int execute_command(int argc, char **argv)
 #else
 		printf ("Unknown command '%s'\n", argv[0]);
 #endif
-		ret = -1;	/* give up after bad command */
+		ret = 1;	/* give up after bad command */
 	}
 
 	getopt_context_restore(&gc);