clk: tegra: Remove needless initializations
clk: tegra: Remove needless initializations

The ret variable is often explicitly initialized to 0, but there is no
need to do so in many cases because it will immediately be overwritten
with the return value from a function.

Signed-off-by: Thierry Reding <3055038c414aef68bf32c33b8118623e7554e0f2@nvidia.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs