fp-print: Don't deference the passed error, use g_set_error instead

It still may be NULL, but we don't protect from that.

libfprint/fp-print.c

@@ -875,8 +875,7 @@ fp_print_deserialize (const guchar *data,
   return g_steal_pointer (&result);
 
 invalid_format:
-  *error = g_error_new_literal (G_IO_ERROR,
-                                G_IO_ERROR_INVALID_DATA,
-                                "Data could not be parsed");
+  g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_DATA,
+               "Data could not be parsed");
   return NULL;
 }