M68k: Fixes for when compiling with modern gcc (from Roman Zippel):
  - Avoid warning 'use of memory input without lvalue in asm operand 0 is
    deprecated' of newer gcc
  - Replace some '%/' with offical '%%' to escape a '%'
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>