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38bfe50508
The LWIP_MALLOC_MEMPOOL macro needs to use the aligned size of the
memp_malloc_helper structure, since mem_alloc() uses it to calculate
the required pool element size. If LWIP_MEM_ALIGN_SIZE(x) is redefined
to align to something larger than 4, then in some cases
the current code can lead to unexpected mem_alloc() failures.
For example:
#define LWIP_MEM_ALIGN_SIZE(size) (((size) + 31) & ~31)
and the largest MALLOC pool is of size 60 bytes, e.g.:
#define LWIP_MALLOC_MEMPOOL(256, 60)
then the following call:
mem_malloc(58)
will cause an assertion.