When clearing the memory of 'key' in function openssh_read(), only the size of the pointer to the data instead of the whole size of struct openssh_key is cleared. Correct the size calculation as detected by Coverity CID 1191543.

#ifndef _GENSIGNKEY_H
#define _GENSIGNKEY_H

#include "signkey.h"

int signkey_generate(enum signkey_type type, int bits, const char* filename);

#endif