USB: sierra: add more checks on shutdown
authorGreg Kroah-Hartman <gregkh@suse.de>
Thu, 26 Apr 2007 07:12:01 +0000 (00:12 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 27 Apr 2007 20:28:40 +0000 (13:28 -0700)
This should help with any potential NULL pointer usages as reported by a
few users.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

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