Added new function krb_err_msg() that should be used instead of

indexing into krb_err_txt[]. The function does a sanity check on the
error code.

Replaced all occurencies of krb_err_txt[].


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@280 ec53bebd-3082-4978-b11e-865c3cabbd6b

appl/xnlock/xnlock.c

@@ -620,7 +620,7 @@ GetPasswd(Widget w, XEvent *_event, String *_s, Cardinal *_n)
 				    fprintf(stderr,
 					    "%s: Warning %s\n",
 					    ProgName,
-					    krb_err_txt[code]);
+					    krb_err_msg(code));
 			    }
 			leave();
 		    }