bnxt_en: allocate enough space for ->ntp_fltr_bmap

bnxt_en: allocate enough space for ->ntp_fltr_bmap

BugLink: http://bugs.launchpad.net/bugs/1690814
[ Upstream commit ac45bd93a5035c2f39c9862b8b6ed692db0fdc87 ]

We have the number of longs, but we need to calculate the number of
bytes required.

Fixes: c0c050c58d84 ("bnxt_en: New Broadcom ethernet driver.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>