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rgblib: return EX_USAGE for usage-related errors

--- a/src/lib/main.c

+++ b/src/lib/main.c

@@ -3,6 +3,7 @@

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

+#include <sysexits.h>

 #include "asmotor.h"

@@ -23,7 +24,7 @@

 	    "\td\tDelete modules from library\n"

 	    "\tl\tList library contents\n"

 	    "\tx\tExtract modules from library\n");

-	exit(0);

+	exit(EX_USAGE);

 }

 /*

  * The main routine

@@ -100,10 +101,10 @@

 							    ("Extracted module '%s'\n",

 							    argv[argn]);

 						} else

-							errx(5,

+							errx(EX_NOINPUT,

 							    "Unable to write module");

 					} else

-						errx(5, "Module not found");

+						errx(EX_NOINPUT, "Module not found");

 					argn += 1;

 					argc -= 1;

@@ -111,12 +112,12 @@

 				lib_Free(lib);

 				break;

 			default:

-				errx(5, "Invalid command");

+				errx(EX_USAGE, "Invalid command");

 				break;

 			}

 		} else {

-			errx(5, "Invalid command");

+			errx(EX_USAGE, "Invalid command");

 		}

 	} else

 		PrintUsage();