cros_run_bvt: Add clarifying information for expected servo_type

BUG=None
TEST=Verified displayed message when incorrect servo_type passed in

Change-Id: I295d71bf715daa995bfcfdb8b21d4624f7e4c093
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crostestutils/+/4769512
Commit-Queue: Kevin Shelton <kmshelton@chromium.org>
Auto-Submit: Bob Moragues <moragues@chromium.org>
Tested-by: Bob Moragues <moragues@chromium.org>
Reviewed-by: YH Lin <yueherngl@chromium.org>
Commit-Queue: Bob Moragues <moragues@chromium.org>
Reviewed-by: Kevin Shelton <kmshelton@chromium.org>
diff --git a/cros_run_bvt b/cros_run_bvt
index 55f5034..03d104b 100755
--- a/cros_run_bvt
+++ b/cros_run_bvt
@@ -103,7 +103,7 @@
   fi
   if [ -z "${DEBUG}" ]; then
     if [ "${DETECTED_SERVO_TYPE}" != "${FLAGS_servo_type}" ]; then
-      die "detected servo type does not match expected servo type"
+      die "detected servo type ${DETECTED_SERVO_TYPE} does not match expected servo type ${FLAGS_servo_type}"
     fi
   fi
 fi