Patch to make it possible to re-attempt to mount ROMFS

[Øyvind Harboe]

If a mount fails, mounting a romfs still
modify cyg_mtab_entry->data. With the patch included,
cyg_mtab_entry->data is only modified after a succesful
mount.

This makes the following codepath impossible:

char address[16];	
sprintf( address, "%p", ROMDIR_ADDR);
err = mount( address, "rom", "romfs" );
if( err < 0 ) 
{
	// if no ROM fs has been written, we use a default one.
	sprintf( address, "%p", _binary___mkromfs_rom_rawdata_start);
	err = mount( address, "rom", "romfs" );
	if (err<0)
      {
 		// unrecoverable failure
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