Fixed case Verify Boot Count After BMC Reboot

Fixed code to match the comment

Signed-off-by: Tony Lee <tony.lee@quantatw.com>
Change-Id: Ib6b8a4982bb019599b1f6071b03993f8032e4be5
diff --git a/lib/common_utils.robot b/lib/common_utils.robot
index 6111117..26d0e8d 100755
--- a/lib/common_utils.robot
+++ b/lib/common_utils.robot
@@ -789,7 +789,7 @@
     Set Global Variable  ${BOOT_COUNT}  ${count}
 
     # Set BOOT_TIME variable to current boot time.
-    Set Global Variable  ${BOOT_COUNT}  ${count}
+    Set Global Variable  ${BOOT_TIME}  ${cur_btime}
 
 
 Delete Error Log Entry