tiny-printf: add static to locally used functions

These two functions are only used in lib/tiny-printf.c .

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Tested-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Stefan Roese <sr@denx.de>
1 file changed