Fix GCC5.4 build error

predictor/framework/channel.h

@@ -116,7 +116,7 @@ class OpChannel : public Channel {
   }
 
   google::protobuf::Message* message_impl(derived_from_message<true>) {
-    return dynamic_cast<const google::protobuf::Message*>(&_data);
+    return dynamic_cast<google::protobuf::Message*>(&_data);
   }
 
   google::protobuf::Message* message_impl(derived_from_message<false>) {

tools/codestyle/cpplint_pre_commit.hook

@@ -4,12 +4,8 @@ TOTAL_ERRORS=0
 
 # The trick to remove deleted files: https://stackoverflow.com/a/2413151
 for file in $(git diff --cached --name-status | awk '$1 != "D" {print $2}'); do
-    if [[ $file =~ ^(paddle/legacy/api/.*|paddle/legacy/capi/.*|paddle/contrib/.*|paddle/legacy/cuda/.*|paddle/legacy/function/.*|paddle/legacy/gserver/.*|paddle/legacy/math/.*|paddle/legacy/optimizer/.*|paddle/legacy/parameter/.*|paddle/legacy/pserver/.*|paddle/legacy/trainer/.*|paddle/legacy/utils/.*|paddle/testing/TestUtil.*|patches/grpc/.*) ]]; then
-        continue;
-    else
-        cpplint --filter=-readability/fn_size $file;
-        TOTAL_ERRORS=$(expr $TOTAL_ERRORS + $?);
-    fi
+    cpplint --filter=-readability/fn_size $file;
+    TOTAL_ERRORS=$(expr $TOTAL_ERRORS + $?);
 done
 
 exit $TOTAL_ERRORS