vPCI: drop bogus locking assertion

msix_find() is a local helper, with all callers explicitly acquiring the
per-domain PCI r/w lock. The checking, which should never have included
the alternative of holding the global PCI devices lock, therefore is
pretty much pointless.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger@xenproject.org>

xen/drivers/vpci/msix.c

@@ -158,8 +158,6 @@ static struct vpci_msix *msix_find(const struct domain *d, unsigned long addr)
 {
     struct vpci_msix *msix;
 
-    ASSERT_PDEV_LIST_IS_READ_LOCKED(d);
-
     list_for_each_entry ( msix, &d->arch.hvm.msix_tables, next )
     {
         const struct vpci_bar *bars = msix->pdev->vpci->header.bars;