Merge branch 'agust@denx.de' of git://git.denx.de/u-boot-staging

* 'agust@denx.de' of git://git.denx.de/u-boot-staging:
  Makefile: add tools/mkenvimage to target 'clean'
  mv_common.c: get rid of 'defined but not used' warning
  m68k: fix ambiguous bit testing
  sparc: fix unknown escape sequence warnings
  sparc: fix unused variable warnings
  sf: fix erase debug output