Follow the change: https://github.com/apache/nuttx/pull/9151,
if MM_CUSTOMIZE_MANAGER is enabled, heap memory manager in host is used,
for example in sim:asan build.
malloc and related allocation APIs will fall back to host_realloc,
do not free memory of zero-length reallocation. So memory allocations
return valid pointer when request zero size in all sim build.
call stack:
malloc() (mm/umm_heap/umm_malloc.c)
mm_malloc() (arch/sim/src/sim/sim_heap.c)
mm_realloc() (arch/sim/src/sim/sim_heap.c)
host_realloc() (arch/sim/src/sim/posix/sim_hostmemory.c)
host_memalign() (arch/sim/src/sim/posix/sim_hostmemory.c)
Signed-off-by: fangxinyong <fangxinyong@xiaomi.com>
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