drivers/net/cxgb3/cxgb3_main.c: prevent reading uninitialized stack memory

drivers/net/cxgb3/cxgb3_main.c: prevent reading uninitialized stack memory

commit 49c37c0334a9b85d30ab3d6b5d1acb05ef2ef6de upstream.

Fixed formatting (tabs and line breaks).

The CHELSIO_GET_QSET_NUM device ioctl allows unprivileged users to read
4 bytes of uninitialized stack memory, because the "addr" member of the
ch_reg struct declared on the stack in cxgb_extension_ioctl() is not
altered or zeroed before being copied back to the user.  This patch
takes care of it.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>