usermod: report error if homedir does not exist

Report error if usermod asked for moving homedir and it does not exist.

Signed-off-by: Tomáš Mráz <tm@t8m.info>
Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>

src/usermod.c

@@ -1882,6 +1882,11 @@ static void move_home (void)
 			         Prog, prefix_user_home, prefix_user_newhome);
 			fail_exit (E_HOMEDIR);
 		}
+	} else {
+		fprintf (stderr,
+		         _("%s: The previous home directory (%s) does not "
+		           "exist or is inaccessible. Move cannot be completed.\n"),
+		         Prog, prefix_user_home);
 	}
 }