USB: wwan: remove an unneeded check

We already verified that "status" was zero on this else branch.  Since
zero is not equal to -ESHUTDOWN, this condition is always true.  I
removed it and pull everything in an indent level.

This doesn't change how the code works, it's just a cleanup.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>