rf24: avoid using variable name data - screws up sdcc

Signed-off-by: Andrew 'Necromant' Andrianov <andrew@ncrmnt.org>
panic: sdcc-friendly fixes

Signed-off-by: Andrew 'Necromant' Andrianov <andrew@ncrmnt.org>
rf24: minor fixes of sdcc errors

Signed-off-by: Andrew 'Necromant' Andrianov <andrew@ncrmnt.org>
contrib: Use menu instead of menuconfig for contrib/

Signed-off-by: Andrew 'Necromant' Andrianov <andrew@ncrmnt.org>