Adding such an attribute is helpful to detect errors related to printf
formats at compile-time.

Link: https://lore.kernel.org/r/20160828165815.25647-1-nicolas.iooss_linux@m4x.orgSigned-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>