clk: visconti: Fix uninitialized variable in printk

The "pll_clck" variable is uninitialized.  The "ret" error code was
supposed to be printed instead.

Fixes: b4cbe606 ("clk: visconti: Add support common clock driver and reset driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220111072529.GJ11243@kili


Signed-off-by: Stephen Boyd <sboyd@kernel.org>