zero-size malloc and ps: kvm_getprocs: Bad address

[Simon 'corecode' Schubert]

YONETANI Tomokazu wrote:
Hello.
On recent -DEVELOPMENT ps command displays a non-intuitive error message
on a non-existent pid:
  ps: kvm_getprocs: Bad address
Apparently the recent malloc reimplementation has changed malloc(3) family
so as malloc(0) now returns a pointer such that useracc() returns EFAULT
for it.
I think we should make malloc(0) return a valid pointer.  Whether to 
return NULL or a pointer is implementation specific, and I believe our 
previous malloc, and most other mallocs out there indeed return a pointer 
and don't return NULL.

cheers
  simon
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