[PATCH] staging: greybus: loopback: remove unused macro argument

[sluisr <luistermc789@gmail.com>]

This patch fixes the checkpatch.pl warning:
WARNING: Argument 'conn' is not used in function-like macro

The gb_dev_loopback_ro_attr macro accepted a 'conn' argument which was
never used in its expansion. The argument was removed from the macro
definition and its invocation.

Signed-off-by: sluisr <contact@sluisr.com>
---
 drivers/staging/greybus/loopback.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
index aa9c73cb0..855d5051c 100644
--- a/drivers/staging/greybus/loopback.c
+++ b/drivers/staging/greybus/loopback.c
@@ -193,7 +193,7 @@ static ssize_t field##_store(struct device *dev,			\
 }									\
 static DEVICE_ATTR_RW(field)
 
-#define gb_dev_loopback_ro_attr(field, conn)				\
+#define gb_dev_loopback_ro_attr(field)				\
 static ssize_t field##_show(struct device *dev,		\
 			    struct device_attribute *attr,		\
 			    char *buf)					\
@@ -305,7 +305,7 @@ gb_dev_loopback_rw_attr(us_wait, d);
 /* Maximum iterations for a given operation: 1-(2^32-1), 0 implies infinite */
 gb_dev_loopback_rw_attr(iteration_max, u);
 /* The current index of the for (i = 0; i < iteration_max; i++) loop */
-gb_dev_loopback_ro_attr(iteration_count, false);
+gb_dev_loopback_ro_attr(iteration_count);
 /* A flag to indicate synchronous or asynchronous operations */
 gb_dev_loopback_rw_attr(async, u);
 /* Timeout of an individual asynchronous request */
-- 
2.53.0