mallinfo and CONFIG_CAN_PASS_STRUCTS

[Takashi Yamamoto]

hi,

depending on CONFIG_CAN_PASS_STRUCTS,
mallinfo has a different prototype.

#ifdef CONFIG_CAN_PASS_STRUCTS
struct mallinfo mallinfo(void);
#else
int      mallinfo(FAR struct mallinfo *info);
#endif

and we have a lot of #ifdef CONFIG_CAN_PASS_STRUCTS
for this even in APPDIR.
i'd like to suggest to simplify this by always using
"int mallinfo(FAR struct mallinfo *info);" version.

or, even "void mallinfo(FAR struct mallinfo *info);" because it
doesn't return any errors.

how do you think?