[PATCH] staging: greybus: Fix coding style and syntax issues

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fix errors from running scripts/checkpatch.pl, including:
- Added spaces before open braces and parentheses where required.
- Resolved macro argument precedence issues by adding parentheses.
- Corrected trailing whitespace and improper indentation.

No functional changes introduced, just cleanups for better code quality.

Signed-off-by: Sayyad Abid <sayyad.abid16@xxxxxxxxx>
---
 drivers/staging/greybus/loopback.c | 58 ++++++++++++++++--------------
 1 file changed, 31 insertions(+), 27 deletions(-)

diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
index 1f19323b0e1a..3e39a90cf86c 100644
--- a/drivers/staging/greybus/loopback.c
+++ b/drivers/staging/greybus/loopback.c
@@ -163,35 +163,39 @@ 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,				\
-			    struct device_attribute *attr,		\
-			    char *buf)					\
-{									\
-	struct gb_loopback *gb = dev_get_drvdata(dev);			\
-	return sprintf(buf, "%" #type "\n", gb->field);			\
-}									\
-static ssize_t field##_store(struct device *dev,			\
-			    struct device_attribute *attr,		\
-			    const char *buf,				\
-			    size_t len)					\
-{									\
-	int ret;							\
-	struct gb_loopback *gb = dev_get_drvdata(dev);			\
-	mutex_lock(&gb->mutex);						\
-	ret = sscanf(buf, "%"#type, &gb->field);			\
-	if (ret != 1)							\
-		len = -EINVAL;						\
-	else								\
-		gb_loopback_check_attr(gb, bundle);			\
-	mutex_unlock(&gb->mutex);					\
-	return len;							\
-}									\
-static DEVICE_ATTR_RW(field)
+do {									\
+	static ssize_t field##_show(struct device *dev			\
+				    struct device_attribute *attr,	\
+				    char *buf)				\
+	{								\
+		struct gb_loopback *gb = dev_get_drvdata(dev);		\
+		return sprintf(buf, "%" #type "\n", gb->field);		\
+	}								\
+	static ssize_t field##_store(struct device *dev,		\
+				    struct device_attribute *attr,	\
+				    const char *buf,			\
+				    size_t len)				\
+	{								\
+		int ret;						\
+		struct gb_loopback *gb = dev_get_drvdata(dev);		\
+		mutex_lock(&gb->mutex);					\
+		ret = sscanf(buf, "%"#type, &gb->field);		\
+		if (ret != 1)						\
+			len = -EINVAL;					\
+		else							\
+			gb_loopback_check_attr(gb, bundle);		\
+		mutex_unlock(&gb->mutex);				\
+		return len;						\
+	}								\
+	static DEVICE_ATTR_RW(field					\
+} while (0)
 
 #define gb_dev_loopback_ro_attr(field, conn)				\
 static ssize_t field##_show(struct device *dev,		\
-- 
2.39.2

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