sata_mv: silence an uninitialized variable warning
Gcc version 4.6.2-12 complains that if we can't find the "nr-ports" property in of_property_read_u32_array() then "n_ports" is used uninitialized. Let's set it to zero in that case. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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