fix some lint errors

include/LightGBM/c_api.h

@@ -249,7 +249,7 @@ LIGHTGBM_C_EXPORT int LGBM_DatasetPushRowsWithMetadata(DatasetHandle dataset,
                                                        const float* weight,
                                                        const double* init_score,
                                                        const int32_t* query,
-                                                       const int32_t* position, 
+                                                       const int32_t* position,
                                                        int32_t tid);
 
 /*!

include/LightGBM/dataset.h

@@ -255,12 +255,9 @@ class Metadata {
       if (!positions_.empty()) {
         size_t max = *std::max_element(positions_.begin(), positions_.end());
         return max + 1;
-      }
-      else
-      {
+      } else {
         return 0;
       }
-
   }
 
   /*!

src/io/metadata.cpp

@@ -266,7 +266,6 @@ void Metadata::CheckOrPartition(data_size_t num_all_data, const std::vector<data
       num_init_score_ = 0;
       Log::Fatal("Initial score size doesn't match data size");
     }
-
   } else {
     if (!queries_.empty()) {
       Log::Fatal("Cannot used query_id for distributed training");