drm: samsung: check pll param while setting HS clock

Add the null check before using the pll param while setting
HS clock via sysfs node.

Bug: 298861923
Test: set HS clock while active and idle
Change-Id: I290b0a4eebed3d55b74241543f236ce236531928
1 file changed
tree: 3f7ed60cf66f2ceaf3ffcb3d994dbc3875f31e56
  1. common/
  2. samsung/
  3. .checkpatch.conf
  4. .clang-format
  5. PREUPLOAD.cfg