Fix filename escaping in c_rehash

CLA: trivial

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from openssl#14301)

tools/c_rehash.in

@@ -161,7 +161,7 @@ sub check_file {
 
 sub link_hash_cert {
 		my $fname = $_[0];
-		$fname =~ s/'/'\\''/g;
+		$fname =~ s/\"/\\\"/g;
 		my ($hash, $fprint) = `"$openssl" x509 $x509hash -fingerprint -noout -in "$fname"`;
 		chomp $hash;
 		chomp $fprint;