[glib/ebassi/aligned-alloc] fixup! Add aligned memory allocators

[Philip Withnall <pwithnall src gnome org>]

commit c0a180025e2b6bd44f96b8882baf0b9bdb9d82f9
Author: Philip Withnall <pwithnall endlessos org>
Date:   Fri Feb 11 13:39:34 2022 +0000

    fixup! Add aligned memory allocators

 glib/gmem.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/glib/gmem.c b/glib/gmem.c
index 17c4add0a..060e91af9 100644
--- a/glib/gmem.c
+++ b/glib/gmem.c
@@ -546,8 +546,8 @@ g_mem_profile (void)
  * g_aligned_alloc:
  * @n_blocks: the number of blocks to allocate
  * @n_block_bytes: the size of each block in bytes
- * @alignment: the alignment to be enforced, which must be a power of 2 and a
- *   multiple of `sizeof(void*)`
+ * @alignment: the alignment to be enforced, which must be a positive power of 2
+ *   and a multiple of `sizeof(void*)`
  *
  * This function is similar to g_malloc(), allocating (@n_blocks * @n_block_bytes)
  * bytes, but care is taken to align the allocated memory to with the given
@@ -569,9 +569,9 @@ g_aligned_alloc (gsize n_blocks,
   gpointer res = NULL;
   gsize real_size;
 
-  if (G_UNLIKELY (alignment & (alignment - 1)) != 0)
+  if (G_UNLIKELY ((alignment == 0) || (alignment & (alignment - 1)) != 0))
     {
-      g_error ("%s: alignment %"G_GSIZE_FORMAT" must be a power of two",
+      g_error ("%s: alignment %"G_GSIZE_FORMAT" must be a positive power of two",
                G_STRLOC, alignment);
     }
 
@@ -643,7 +643,8 @@ g_aligned_alloc (gsize n_blocks,
  * g_aligned_alloc0:
  * @n_blocks: the number of blocks to allocate
  * @n_block_bytes: the size of each block in bytes
- * @alignment: the alignment to be enforced, as a power of 2
+ * @alignment: the alignment to be enforced, which must be a positive power of 2
+ *   and a multiple of `sizeof(void*)`
  *
  * This function is similar to g_aligned_alloc(), but it will
  * also clear the allocated memory before returning it.