Merge branch 'master' of git://git.denx.de/u-boot-nand-flash

* 'master' of git://git.denx.de/u-boot-nand-flash:
  nand_spl/nand_boot.c: Fix build warning
  drivers/mtd/nand/nand_spl_load.c: Fix GCC 4.6 warning
  drivers/mtd/nand/nand_spl_simple.c: Fix GCC 4.6 warnings