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.

open(IN,"<crypt.ind");
open(OUT,">crypt.ind.tmp");
$a = <IN>;
print OUT  "$a\n\\addcontentsline{toc}{chapter}{Index}\n";
while (<IN>) {
   print OUT $_;
}
close OUT;
close IN;
system("mv -f crypt.ind.tmp crypt.ind");