Function checkpointer

bsgsd.cpp:2295–2300

void checkpointer(void *ptr,const char *file,const char *function,const  char *name,int line)	{
	if(ptr == NULL)	{
		fprintf(stderr,"[E] error in file %s, %s pointer %s on line %i\n",file,function,name,line); 
		exit(EXIT_FAILURE);
	}
}

void writekey(bool compressed,Int *key)	{
	Point publickey;