Fixed a bug in main.c

git-svn-id: file:///var/johncronin-svn/rpi-boot@112 0f3ef04d-8e58-4d2a-b558-b31704943fbb
Merge branch 'master' of github.com:jncronin/rpi-boot

git-svn-id: file:///var/johncronin-svn/rpi-boot@113 0f3ef04d-8e58-4d2a-b558-b31704943fbb
Merge branch 'master' of github.com:jncronin/rpi-boot

git-svn-id: file:///var/johncronin-svn/rpi-boot@114 0f3ef04d-8e58-4d2a-b558-b31704943fbb
Remove unnecessary reference to memory_barrier()



git-svn-id: file:///var/johncronin-svn/rpi-boot@115 0f3ef04d-8e58-4d2a-b558-b31704943fbb