Fix a segfault for flash read_bank by adopting the default read implementation. Change-Id: I09e030d9a7669b848a1743aaba03875bf408c7ee Signed-off-by: Andreas Färber <afaerber@suse.de> Reviewed-on: http://openocd.zylin.com/3431 Tested-by: jenkins Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>