m68k: Return semihosting errno values correctly Fixing a simple typo, s/errno/err/, that caused the error status from GDB semihosted system calls to be returned incorrectly. Signed-off-by: Meador Inge <meadori@codesourcery.com> Reviewed-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>