max_m5: fix test for empty in max_m5_check_state_data()

Fix test for uninitialized GMSR data in max_m5_check_state_data()
and change the return codes. Small changes in the messages.

Bug: 174788070
Test: boot with invalid FG state, good GMSR state
Signed-off-by: AleX Pelosi <[email protected]>
Change-Id: I76be3bd998ab65efb7b69748a989fc1b8a962878
2 files changed