Staging: dgnc: Merge lines and remove unused variable for immediate return

This patch merges two lines in a single line if immediate
return is found. It also removes unnecessory variable rc
as it is no longer needed.

This is done using Coccinelle. Semantic patch used for this
is as follows:

@@
type T;
identifier i;
identifier f;
constant C;
@@
- T i;
  ...when != i
     when strict
(
  return -C;
|
- i =
+ return
     f(...);
- return i;
)

Signed-off-by: Vaishali Thakkar <vthakkar1994@gmail.com>
Reviewed-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgnc/dgnc_tty.c

@@ -2286,7 +2286,6 @@ static inline int dgnc_get_mstat(struct channel_t *ch)
 static int dgnc_get_modem_info(struct channel_t *ch, unsigned int  __user *value)
 {
 	int result;
-	int rc;
 
 	if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 		return -ENXIO;
@@ -2296,9 +2295,7 @@ static int dgnc_get_modem_info(struct channel_t *ch, unsigned int  __user *value
 	if (result < 0)
 		return -ENXIO;
 
-	rc = put_user(result, value);
-
-	return rc;
+	return put_user(result, value);
 }