clk: document that clk_get_parent() returns NULL

The documentation in the clk.h file says that clk_get_parent() returns
error pointers but it doesn't.  It's also not consistent with the
comments next to the clk_get_parent() implementation which say that
it returns NULL when the clk is NULL.  Update the comments so they
are consistent and accurate and say that it returns NULL.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Brian Masney <bmasney@redhat.com>

0 files changed, 0 insertions, 0 deletions