[UNIKRAFT/LWIP PATCH] alloc.c: Include missing `<stddef.h>`

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Include `<stddef.h>` that provides the definition for `size_t`.

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 alloc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/alloc.c b/alloc.c
index a5b4377..af52f27 100644
--- a/alloc.c
+++ b/alloc.c
@@ -32,6 +32,7 @@
  */
 
 #include <uk/alloc.h>
+#include <stddef.h>
 
 void *sys_malloc(size_t size)
 {
-- 
2.20.1