iommu/amd: Propagate the error code returned by __modify_irte_ga() in modify_irte_ga()

iommu/amd: Propagate the error code returned by __modify_irte_ga() in modify_irte_ga()

The return type of __modify_irte_ga() is int, but modify_irte_ga()
treats it as a bool. Casting the int to bool discards the error code.

To fix the issue, change the type of ret to int in modify_irte_ga().

Fixes: 57cdb720eaa5 ("iommu/amd: Do not flush IRTE when only updating isRun and destination fields")
Cc: stable@vger.kernel.org
Signed-off-by: Jinhui Guo <guojinhui.liam@bytedance.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>