USB: sierra: add more checks on shutdown
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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This should help with any potential NULL pointer usages as reported by a
few users.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>