[PATCH] input: yealink: Constify attribute_group structures.

attribute_groups are not supposed to change at runtime. All functions
working with attribute_groups provided by <linux/sysfs.h> work with const
attribute_group. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
   6039	    944	      0	   6983	   1b47	drivers/input/misc/yealink.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
   6103	    880	      0	   6983	   1b47	drivers/input/misc/yealink.o

Signed-off-by: Arvind Yadav <redacted>
---
 drivers/input/misc/yealink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/misc/yealink.c b/drivers/input/misc/yealink.c
index 6e7ff95..a1e0ff5 100644
--- a/drivers/input/misc/yealink.c
+++ b/drivers/input/misc/yealink.c

@@ -798,7 +798,7 @@ static ssize_t store_ringtone(struct device *dev,
 	NULL
 };
 
-static struct attribute_group yld_attr_group = {
+static const struct attribute_group yld_attr_group = {
 	.attrs = yld_attributes
 };
 

-- 
1.9.1