[PATCH v2] accel/amdxdna: Add missing include linux/slab.h

[Su Hui <suhui@xxxxxxxxxxxx>]

When compiling without CONFIG_IA32_EMULATION, there can be some errors:

drivers/accel/amdxdna/amdxdna_mailbox.c: In function ‘mailbox_release_msg’:
drivers/accel/amdxdna/amdxdna_mailbox.c:197:2: error: implicit declaration
of function ‘kfree’.
  197 |  kfree(mb_msg);
      |  ^~~~~
drivers/accel/amdxdna/amdxdna_mailbox.c: In function ‘xdna_mailbox_send_msg’:
drivers/accel/amdxdna/amdxdna_mailbox.c:418:11: error:implicit declaration
of function ‘kzalloc’.
  418 |  mb_msg = kzalloc(sizeof(*mb_msg) + pkg_size, GFP_KERNEL);
      |           ^~~~~~~

Add the missing include.

Fixes: b87f920b9344 ("accel/amdxdna: Support hardware mailbox")
Signed-off-by: Su Hui <suhui@xxxxxxxxxxxx>
Reviewed-by: Lizhi Hou <lizhi.hou@xxxxxxx>
---
v2:
 - move the header to the include block above and keep it sorted(Jacek Lawrynowicz).

 drivers/accel/amdxdna/amdxdna_mailbox.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/accel/amdxdna/amdxdna_mailbox.c b/drivers/accel/amdxdna/amdxdna_mailbox.c
index 814b16bb1953..e5301fac1397 100644
--- a/drivers/accel/amdxdna/amdxdna_mailbox.c
+++ b/drivers/accel/amdxdna/amdxdna_mailbox.c
@@ -8,6 +8,7 @@
 #include <linux/bitfield.h>
 #include <linux/interrupt.h>
 #include <linux/iopoll.h>
+#include <linux/slab.h>
 #include <linux/xarray.h>
 
 #define CREATE_TRACE_POINTS
-- 
2.30.2