[PATCH] staging: fbtft: avoid empty macro argument in define_fbtft_write_reg

[Zile Xiong]

Replace the empty modifier argument with a simple identity macro.
This fixes the error reported by scripts/checkpatch.pl while keeping
the original semantics unchanged.

The generated code is equivalent and builds successfully.

Signed-off-by: Zile Xiong <xiongzile99@xxxxxxxxx>
---
 drivers/staging/fbtft/fbtft-bus.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/fbtft/fbtft-bus.c b/drivers/staging/fbtft/fbtft-bus.c
index 30e436ff19e4..380dd374a566 100644
--- a/drivers/staging/fbtft/fbtft-bus.c
+++ b/drivers/staging/fbtft/fbtft-bus.c
@@ -61,10 +61,10 @@ out:									      \
 	va_end(args);                                                         \
 }                                                                             \
 EXPORT_SYMBOL(func);
-
-define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8, )
+#define fbtft_identity(x) (x)
+define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8, fbtft_identity)
 define_fbtft_write_reg(fbtft_write_reg16_bus8, __be16, u16, cpu_to_be16)
-define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16, )
+define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16, fbtft_identity)
 
 void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...)
 {
-- 
2.20.1