commit a4766dc033c042800a51384b8c00c621d77fff9e
author Keith Mok <keithmok@google.com> Wed Apr 13 04:00:41 2022 +0000
committer Keith Mok <keithmok@google.com> Wed Apr 13 22:45:10 2022 +0000
tree 99e8183a11cd36eb1997aaaab94e27e13eba0b0d
parent 4a0abad6f1b70ff18eb5ade27196da02d66f07b2

Fix CtsKernelConfigTestCases cts-on-gsi

run cts-on-gsi -m CtsKernelConfigTestCases
will failed on device with kernel not enabled
CONFIG_PSTORE_PMSG. If CONFIG_PSTORE_PMSG not enabled
/dev/pmsg0 device node will not exists, but
echo HELLOWORLD > /dev/pmsg0 will tries to create a file
in /dev folder which will failed.

Since CONFIG_PSTORE_PMSG is not a mandatory config,
add a checking to see if /dev/pmsg0 exist first before
echo/write into it.

Bug: 215043302
Test: On device kernel without CONFIG_PSTORE_PMSG enabled
      run cts-on-gsi -m CtsKernelConfigTestCases
Change-Id: I5009558fc3a853772c27e5967eb49bd44f171ae0
(cherry picked from commit 745b67e86f2e1d44462dbda25f9ae7166d1511b8)