Remove the double empty lines from all source files (#2009)

* Run dos2unix for all source files

* Remove the trail space from all source files

* Remove the double empty lines from all source files

examples/porting/lv_port_fs_template.c

@@ -36,7 +36,6 @@ typedef struct {
     uint32_t dummy2;
 }dir_t;
 
-
 /**********************
  *  STATIC PROTOTYPES
  **********************/
@@ -157,7 +156,6 @@ static lv_fs_res_t fs_open (lv_fs_drv_t * drv, void * file_p, const char * path,
     return res;
 }
 
-
 /**
  * Close an opened file
  * @param drv pointer to a driver where this function belongs