[PATCH] staging: rtl8822be: Keep array subscript no lower than zero

[Larry Finger]

The kbuild test robot reports the following:
   drivers/staging//rtlwifi/phydm/phydm_dig.c: In function 'odm_pause_dig':
   drivers/staging//rtlwifi/phydm/phydm_dig.c:494:45: warning: array subscript 
is below array bounds [-Warray-bounds]
      odm_write_dig(dm, dig_tab->pause_dig_value[max_level]);

This condition is caused when a loop falls through. The fix is to pin
max_level to be >= 0.

Signed-off-by: Larry Finger <larry.fin...@lwfinger.net>
c: kbuild test robot <fengguang...@intel.com>
Fixes: 9ce99b04b5b82fdf11e4c76b60a5f82c1e541297 staging: r8822be: Add phydm 
mini driver
---
 drivers/staging/rtlwifi/phydm/phydm_dig.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/rtlwifi/phydm/phydm_dig.c 
b/drivers/staging/rtlwifi/phydm/phydm_dig.c
index 31a4f3fcad19..c88b9788363a 100644
--- a/drivers/staging/rtlwifi/phydm/phydm_dig.c
+++ b/drivers/staging/rtlwifi/phydm/phydm_dig.c
@@ -490,6 +490,8 @@ void odm_pause_dig(void *dm_void, enum phydm_pause_type 
pause_type,
                                break;
                }
 
+               /* pin max_level to be >= 0 */
+               max_level = max_t(s8, 0, max_level);
                /* write IGI of lower level */
                odm_write_dig(dm, dig_tab->pause_dig_value[max_level]);
                ODM_RT_TRACE(dm, ODM_COMP_DIG,
-- 
2.12.3