fs: xfs needs inode_wait to be exported

Since wait_on_inode() references it.

Signed-off-by: Stephen Rothwell <[e-mail]>
Reviewed-by: Dave Chinner <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Lachlan McIlroy <[e-mail]>

fs/inode.c

···
 	schedule();
 	return 0;
 }
+EXPORT_SYMBOL(inode_wait);
 
 /*
  * If we try to find an inode in the inode hash while it is being