[PATCH] uml: fix device unplug crash
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: NJeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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