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