tests: Exit with skipped exit code when test not performed

These tests were not performed and therefore did not pass, nor fail. This
fixes misleading test exit code where, for instance, the pseries_test will
pass on i386-pc, which is not a pseries architecture.

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

tests/ohci_test.in

@@ -22,16 +22,16 @@ grubshell=@builddir@/grub-shell
 case "${grub_modinfo_target_cpu}-${grub_modinfo_platform}" in
     # PLATFORM: Don't mess with real devices when OS is active
     *-emu)
-	exit 0;;
+	exit 77;;
     # FIXME: qemu gets bonito DMA wrong
     mipsel-loongson)
-	exit 0;;
+	exit 77;;
     # PLATFORM: no USB on ARC and qemu-mips platforms
     mips*-arc | mips*-qemu_mips)
-	exit 0;;
+	exit 77;;
     # FIXME: No native drivers are available for those
     powerpc-ieee1275 | sparc64-ieee1275 | arm*-efi)
-	exit 0;;
+	exit 77;;
 esac
 
 imgfile="`mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX"`" || exit 99