engines/sg: kill dead function

This makes clang error out.

Fixes: bc596cbcdbb5 ("t/zbd: Add multi-job libaio test")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/engines/sg.c b/engines/sg.c
index d681ac9..bf437c8 100644
--- a/engines/sg.c
+++ b/engines/sg.c
@@ -157,11 +157,6 @@
 #endif
 };
 
-static inline uint16_t sgio_get_be16(uint8_t *buf)
-{
-	return be16_to_cpu(*((uint16_t *) buf));
-}
-
 static inline uint32_t sgio_get_be32(uint8_t *buf)
 {
 	return be32_to_cpu(*((uint32_t *) buf));