gallium/util: Add align_calloc

Add implementation for align_calloc,
which is align_malloc + memset.

v2: add if (ptr) before memset.
Fix indentation.

Signed-off-by: Axel Davy <axel.davy@ens.fr>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/gallium/auxiliary/util/u_memory.h

@@ -63,6 +63,14 @@ extern "C" {
 #define align_malloc(_size, _alignment) os_malloc_aligned(_size, _alignment)
 #define align_free(_ptr) os_free_aligned(_ptr)
 
+static inline void *
+align_calloc(size_t size, unsigned long alignment)
+{
+   void *ptr = align_malloc(size, alignment);
+   if (ptr)
+      memset(ptr, 0, size);
+   return ptr;
+}
 
 /**
  * Duplicate a block of memory.