(read_host_key): Fixed string leak.

Rev: src/server.c:1.73

src/server.c

@@ -213,6 +213,8 @@ read_host_key(const char *file,
   s = spki_make_signer(signature_algorithms,
 		       contents,
 		       &algorithm_name);
+  lsh_string_free(contents);
+  
   if (!s)
     {
       werror("Invalid host key\n");