automated: ltp: prevent failing LAVA job if rm TMP_DIR fails

Change-Id: I0f116bdfa49442bcddc2edc537e388c09ea566a7
Signed-off-by: Milosz Wasilewski <milosz.wasilewski@linaro.org>
diff --git a/automated/linux/ltp/ltp.sh b/automated/linux/ltp/ltp.sh
index e4d8fd6..91a66ff 100755
--- a/automated/linux/ltp/ltp.sh
+++ b/automated/linux/ltp/ltp.sh
@@ -97,7 +97,8 @@
 
     parse_ltp_output "${OUTPUT}/LTP_${LOG_FILE}.log"
     # Cleanup
-    rm -rf "${LTP_TMPDIR}"
+    # don't fail the whole test job if rm fails
+    rm -rf "${LTP_TMPDIR}" || true
 }
 
 # Test run.