scsi-disk: Fix typo (uint32 -> uint32_t)

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NStefan Weil <sw@weilnetz.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/scsi-disk.c

@@ -1461,7 +1461,7 @@ static void scsi_unmap_complete(void *opaque, int ret)
     SCSIDiskReq *r = data->r;
     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
     uint64_t sector_num;
-    uint32 nb_sectors;
+    uint32_t nb_sectors;
 
     r->req.aiocb = NULL;
     if (ret < 0) {