Currently, we are checking the clock struct pointer for NULL
returned from clk_get functions. certain critical clocks might
have NULL returned for clk pointer, since they are enabled during
boot itself. Update return check condition for err only and ignore
NULL value and skip its usage.
CRs-Fixed: 3296865
Change-Id: I5c1852f2348ae8aeeb0508a2f4a052a8c4f1989e
Signed-off-by: Mukund Madhusudan Atre <quic_matre@quicinc.com>