[DTV00857290][DTV][Coverity Scanned Code Defect]

[Description]
Fix coverity defects under nic/nic_rate.c

Fix Uninitialized scalar variable
 - Cid#361785 in line 411
 - Cid#361786 in line 415

Change-Id: I9893058c93360d641b9db1551aa609d441c23d22
Signed-off-by: Alice Ou <alice.ou@mediatek.com>
CR-Id: DTV00857290
(cherry picked from commit 53deb4db2b84c6d71eedb65b76c9d60534761192)
(cherry picked from commit 07154a7fbc401ba110190313979e38e8aec08ea1)
(cherry picked from commit 7264436c1cf9b361682b8fa680ece35388ca7490)
1 file changed