Update src/flight/filter.c

Co-authored-by: Hugo Chiang <[email protected]>

src/flight/filter.c

@@ -168,7 +168,7 @@ static float fix_road(float *series, float *series_b, int index, int filter_n, i
           series_b[cur_index] = minValue;
       }
       prev_val = cur_val;
-      prev_val_b = cur_val_b; 
+      prev_val_b = cur_val_b;
       cur_index++;
       index_pos++;
     }