If the remaining memory for the buffer is less than 256 bytes,
the memory allocated for the write algorithm in the target is not freed.
Fixes: ba131f30a0 (Flash driver for STM32G0xx and STM32G4xx)
Change-Id: Ic649f6c39799d76725b0c69ff3a009a3f510e17f
Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6486
Tested-by: jenkins
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>