Unwriteable directories are errors

Make the script and app match the documentation.
Reviewed-by: NTim Hudson <tjh@openssl.org>

apps/rehash.c

@@ -315,7 +315,7 @@ static int do_dir(const char *dirname, enum Hash h)
 
     if (app_access(dirname, W_OK) < 0) {
         BIO_printf(bio_err, "Skipping %s, can't write\n", dirname);
-        return 0;
+        return 1;
     }
     buflen = strlen(dirname);
     pathsep = (buflen && dirname[buflen - 1] == '/') ? "" : "/";

tools/c_rehash.in

@@ -6,6 +6,7 @@
 my $dir;
 my $prefix;
 
+my $errorcount = 0;
 my $openssl = $ENV{OPENSSL} || "openssl";
 my $pwd;
 my $x509hash = "-subject_hash";
@@ -89,9 +90,11 @@ foreach (@dirlist) {
 		hash_dir($_);
             } else {
                 print "Skipping $_, can't write\n";
+                $errorcount++;
             }
 	}
 }
+exit($errorcount);
 
 sub hash_dir {
 	my %hashlist;