[gegl] gegl-scratch: remove NULL pointer guarantees

[Ell <ell src gnome org>]

commit d98ea19777b6ccf78a6cc158212f13111fec5d93
Author: Ell <ell_se yahoo com>
Date:   Fri Jan 11 07:41:38 2019 -0500

    gegl-scratch: remove NULL pointer guarantees
    
    In gegl-scratch, don't guarantee that allocating a 0-sized block
    results in a NULL pointer, or that freeing a NULL pointer is valid.
    It is still valid, however, to allocate 0-sized blocks, and to free
    the returned pointers.

 gegl/buffer/gegl-scratch.c | 9 ---------
 gegl/buffer/gegl-scratch.h | 5 -----
 2 files changed, 14 deletions(-)
---
diff --git a/gegl/buffer/gegl-scratch.c b/gegl/buffer/gegl-scratch.c
index 7b41324c2..b5bfc18e4 100644
--- a/gegl/buffer/gegl-scratch.c
+++ b/gegl/buffer/gegl-scratch.c
@@ -149,9 +149,6 @@ gegl_scratch_alloc (gsize size)
   GeglScratchContext *context;
   GeglScratchBlock   *block;
 
-  if (G_UNLIKELY (! size))
-    return NULL;
-
   if (G_UNLIKELY (size > GEGL_SCRATCH_MAX_BLOCK_SIZE))
     {
       block = gegl_scratch_block_new ((GeglScratchContext *) &void_context,
@@ -189,9 +186,6 @@ gegl_scratch_alloc0 (gsize size)
 {
   gpointer ptr;
 
-  if (G_UNLIKELY (! size))
-    return NULL;
-
   ptr = gegl_scratch_alloc (size);
 
   memset (ptr, 0, size);
@@ -205,9 +199,6 @@ gegl_scratch_free (gpointer ptr)
   GeglScratchContext *context;
   GeglScratchBlock   *block;
 
-  if (G_UNLIKELY (! ptr))
-    return;
-
   context = g_private_get (&gegl_scratch_context);
   block   = (GeglScratchBlock *) ((guint8 *) ptr -
                                   GEGL_SCRATCH_BLOCK_DATA_OFFSET);
diff --git a/gegl/buffer/gegl-scratch.h b/gegl/buffer/gegl-scratch.h
index 21ba11cca..08e18366d 100644
--- a/gegl/buffer/gegl-scratch.h
+++ b/gegl/buffer/gegl-scratch.h
@@ -25,7 +25,6 @@
  * @size: the number of bytes to allocte.
  *
  * Allocates @size bytes of scratch memory.
- * If @size is 0 it returns NULL.
  *
  * Returns a pointer to the allocated memory.
  */
@@ -36,7 +35,6 @@ gpointer   gegl_scratch_alloc  (gsize    size) G_GNUC_MALLOC;
  * @size: the number of bytes to allocte.
  *
  * Allocates @size bytes of scratch memory, initialized to zero.
- * If @size is 0 it returns NULL.
  *
  * Returns a pointer to the allocated memory.
  */
@@ -47,7 +45,6 @@ gpointer   gegl_scratch_alloc0 (gsize    size) G_GNUC_MALLOC;
  * @ptr: the memory to free.
  *
  * Frees the memory pointed to by @ptr.
- * If @ptr is NULL, does nothing.
  *
  * The memory must have been allocated using one of the scratch-memory
  * allocation functions.
@@ -65,7 +62,6 @@ void       gegl_scratch_free   (gpointer ptr);
  *
  * Allocates @n elements of type @type using scratch memory.
  * The returned pointer is cast to a pointer to the given type.
- * If @n is 0 it returns %NULL.
  * Care is taken to avoid overflow when calculating the size of
  * the allocated block.
  *
@@ -88,7 +84,6 @@ void       gegl_scratch_free   (gpointer ptr);
  * Allocates @n elements of type @type using scratch memory,
  * initialized to 0.
  * The returned pointer is cast to a pointer to the given type.
- * If @n is 0 it returns %NULL.
  * Care is taken to avoid overflow when calculating the size of
  * the allocated block.
  *