wrong excepted retval in nyx.h

[azanegin]

packer/nyx.h

Line 243 in ef990c6

*hprintf_buffer = (uint8_t*)mmap((void*)NULL, HPRINTF_MAX_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

packer/nyx.h

Line 245 in ef990c6

if(!*hprintf_buffer){

On linux userspace targets at least, this will probably lead to an error.

Citing 'man mmap':

On error, the value MAP_FAILED (that is, (void *) -1) is returned, and errno is set to indicate the error.