uses list_for_each_entry() for
dev->msi_list that suspected to have entries same numbers as nvec, and
it doesn't check the number of allocated vectors and passed arg nvec.
Therefore it will result in success of pci_enable_msix(), with less
vectors allocated than requested.

This patch fixes the error route to return -ENOMEM, instead of continuing
the setup (proposed by Matthew Wilcox).

Note that there is no iounmap in msi_free_irqs() if no msi_disc is
allocated.

Reviewed-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
&𓮛.x