[PATCH] hw/block/nvme: Verify msix_vector_use() returned value

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

msix_vector_use() returns -EINVAL on error. Assert it won't.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
Notes taken while reviewing:
https://www.mail-archive.com/qemu-block@nongnu.org/msg66831.html
Based-on: <20200514044611.734782-1-its@irrelevant.dk>
---
 hw/block/nvme.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 0cb54d902d..5fee563e99 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -613,6 +613,10 @@ static uint16_t nvme_del_cq(NvmeCtrl *n, NvmeCmd *cmd)
 static void nvme_init_cq(NvmeCQueue *cq, NvmeCtrl *n, uint64_t dma_addr,
     uint16_t cqid, uint16_t vector, uint16_t size, uint16_t irq_enabled)
 {
+    int ret;
+
+    ret = msix_vector_use(&n->parent_obj, vector);
+    assert(ret == 0);
     cq->ctrl = n;
     cq->cqid = cqid;
     cq->size = size;
@@ -623,7 +627,6 @@ static void nvme_init_cq(NvmeCQueue *cq, NvmeCtrl *n, uint64_t dma_addr,
     cq->head = cq->tail = 0;
     QTAILQ_INIT(&cq->req_list);
     QTAILQ_INIT(&cq->sq_list);
-    msix_vector_use(&n->parent_obj, cq->vector);
     n->cq[cqid] = cq;
     cq->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, nvme_post_cqes, cq);
 }
-- 
2.21.3