m68k: Return semihosting errno values correctly

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>
(cherry picked from commit aed91c1bff5e568c7b0fbd0e1e7e2f9e62409e73)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>