scripts: added return code in run_cpplint

scripts/run_cpplint.sh

@@ -75,6 +75,8 @@ PARENTHESIS_RULE=",-whitespace/parens"
 C_CAST_RULE=",-readability/casting"
 LONG_LINES_RULE=",-whitespace/line_length"
 
+retval=true
+
 ##Excluded files
 RAND_FILES=( embb_mtapi_test_group.cc embb_mtapi_test_queue.cc embb_mtapi_test_task.cc queue_test-inl.h )
 for project in base_c mtapi_c base_cpp mtapi_cpp algorithms_cpp containers_cpp dataflow_cpp
@@ -119,5 +121,10 @@ do
       fi
     done
     python ${c} --filter=$current_rules --root="$project/include" --output=vs7 $file
+    if [ $? != $0 ]; then
+      retval=false
+    fi
   done
 done
+
+$retval