net/sfc/base: fix warnings from VS2015 C compiler (C4310)
net/sfc/base: fix warnings from VS2015 C compiler (C4310)

Fix level 4 warning
"C4310: cast truncates constant value";
no functional changes.

Fixes: 354df7eadf66 ("net/sfc/base: import bootrom configuration")
Cc: stable@dpdk.org

Signed-off-by: Andrew Lee <d14c31299facb10bc908e1762f35f6abb5a2888a@solarflare.com>
Signed-off-by: Andrew Rybchenko <ac94ab2a8fe9a9a087f6e24dcbc16626b52c07e8@solarflare.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk