clk: tegra: fix __clk_lookup() return value checks
clk: tegra: fix __clk_lookup() return value checks

In case of error, the function __clk_lookup() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check should
be replaced with NULL test.

Signed-off-by: Wei Yongjun <b8f9cab8be13de37b9588aedad10a20fc3a68783@trendmicro.com.cn>
Signed-off-by: Peter De Schrijver <651dda1e35c6fe8f72c3112540c405a2364bcd71@nvidia.com>

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