staging: dgap: driver.c: removes smatch warning "redundant null check"

This patch removes these smatch warnings from dgap_driver.c:

redundant null check on dgap_config_buf calling kfree()
redundant null check on brd->flipbuf calling kfree()
redundant null check on brd->flipflagbuf calling kfree()
Signed-off-by: Lidza Louina <lidza.louina@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgap/dgap_driver.c

@@ -416,7 +416,6 @@ void dgap_cleanup_module(void)
 		unregister_chrdev(DIGI_DGAP_MAJOR, "dgap");
 	}
 
-	if (dgap_config_buf)
 	kfree(dgap_config_buf);
 
 	for (i = 0; i < dgap_NumBoards; ++i) {
@@ -484,9 +483,7 @@ static void dgap_cleanup_board(struct board_t *brd)
 		}
 	}
 
-	if (brd->flipbuf)
 	kfree(brd->flipbuf);
-	if (brd->flipflagbuf)
 	kfree(brd->flipflagbuf);
 
 	dgap_Board[brd->boardnum] = NULL;