[PATCH] staging: greybus: Enclose multi-statement macro in do-while loop

["Juan José Arboleda" <soyjuanarbol@gmail.com>]

The macro `gb_loopback_stats_attrs` in the Greybus loopback driver
contains multiple statements, which should be enclosed in a do-while
loop to ensure proper execution and adhere to coding standards.

This patch modifies the `gb_loopback_stats_attrs` macro to enclose
its statements in a do-while loop, addressing the style error flagged
by checkpatch.pl.

Signed-off-by: Juan José Arboleda <soyjuanarbol@gmail.com>
---
 drivers/staging/greybus/loopback.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
index 4313d3bbc23a..a97de86c67a5 100644
--- a/drivers/staging/greybus/loopback.c
+++ b/drivers/staging/greybus/loopback.c
@@ -163,9 +163,11 @@ static ssize_t name##_avg_show(struct device *dev,		\
 static DEVICE_ATTR_RO(name##_avg)
 
 #define gb_loopback_stats_attrs(field)				\
-	gb_loopback_ro_stats_attr(field, min, u);		\
-	gb_loopback_ro_stats_attr(field, max, u);		\
-	gb_loopback_ro_avg_attr(field)
+	do {							\
+		gb_loopback_ro_stats_attr(field, min, u);	\
+		gb_loopback_ro_stats_attr(field, max, u);	\
+		gb_loopback_ro_avg_attr(field);			\
+	} while (0)
 
 #define gb_loopback_attr(field, type)					\
 static ssize_t field##_show(struct device *dev,				\
-- 
2.45.2