If the error message is going to be ambiguous, try to give the user some clue
by returning the last error reported by the OS.

Index: trunk/src/clients/kinit/kinit.c
===================================================================
--- trunk.orig/src/clients/kinit/kinit.c
+++ trunk/src/clients/kinit/kinit.c
@@ -658,8 +658,14 @@ k5_kinit(opts, k5)
     code = krb5_cc_initialize(k5->ctx, k5->cc,
 			      opts->canonicalize ? my_creds.client : k5->me);
     if (code) {
-	com_err(progname, code, "when initializing cache %s",
-		opts->k5_cache_name?opts->k5_cache_name:"");
+	if ((code == KRB5_CC_IO) && (errno != 0)) {
+	    com_err(progname, code, "when initializing cache %s: %s",
+		    opts->k5_cache_name?opts->k5_cache_name:"",
+		    strerror(errno));
+	} else {
+	    com_err(progname, code, "when initializing cache %s",
+		    opts->k5_cache_name?opts->k5_cache_name:"");
+	}
 	goto cleanup;
     }