clk: lochnagar: Don't reference clk_init_data after registration

A future patch is going to change semantics of clk_register() so that
clk_hw::init is guaranteed to be NULL after a clk is registered. Avoid
referencing this member here so that we don't run into NULL pointer
exceptions.

Cc: Charles Keepax <[e-mail]>
Cc: Richard Fitzgerald <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>
Link: https://lkml.kernel.org/r/[e-mail]
Acked-by: Charles Keepax <[e-mail]>

drivers/clk/clk-lochnagar.c

···
 	if (ret < 0) {
 		dev_dbg(priv->dev, "Failed to read parent of %s: %d\n",
 			lclk->name, ret);
-		return hw->init->num_parents;
+		return clk_hw_get_num_parents(hw);
 	}
 
 	val &= lclk->src_mask;