clk: h8300: Drop allocation printk and cleanup sizeof style

We don't need to print an error on allocation failures, drop it.
While we're here, change the sizeof() to be sizeof(*<ptr>) to
make code more future proof.

Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>