[PATCH 3/6] UML - Fix device unplug crash

[Jeff Dike]

Fix a NULL dereference when unplugging a device.  The default value of
err_msg wants to be "" in case the driver doesn't modify it.

Signed-off-by: Jeff Dike <jdike@xxxxxxxxxxxxxxx>
--
 arch/um/drivers/mconsole_kern.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6.21-mm/arch/um/drivers/mconsole_kern.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/drivers/mconsole_kern.c	2007-03-27 11:35:47.000000000 -0400
+++ linux-2.6.21-mm/arch/um/drivers/mconsole_kern.c	2007-03-27 11:46:28.000000000 -0400
@@ -614,6 +614,9 @@ void mconsole_remove(struct mc_request *
 	err_msg = NULL;
 	err = (*dev->remove)(n, &err_msg);
 	switch(err){
+	case 0:
+		err_msg = "";
+		break;
 	case -ENODEV:
 		if(err_msg == NULL)
 			err_msg = "Device doesn't exist";
-
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