nvme: allocate aligned payloads for all nvme commands

The kernel supports since v5.2 direct mapped DMA buffers to userspace.
Up to this point a bounce buffer was involved. Because the buffers are
now directly accessed by the device, the rules of alignment also apply
for the payloads.

Use the newly introduced nvme_alloc helper to allocate correctly aligned
payloads for all nvme commands.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

nvme-print.h

@@ -8,8 +8,8 @@
 #include <ccan/list/list.h>
 
 typedef struct nvme_effects_log_node {
+	struct nvme_cmd_effects_log effects; /* needs to be first member because of alignment requirement. */
 	enum nvme_csi csi;
-	struct nvme_cmd_effects_log effects;
 	struct list_node node;
 } nvme_effects_log_node_t;