bonding: documentation and code cleanup for resend_igmp

Improves the documentation about how IGMP resend parameter
works, fix two missing checks and coding style issues.

Signed-off-by: Flavio Leitner <fbl@redhat.com>
Acked-by: Rick Jones <rick.jones2@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index bb1319f..88fcb25 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -1533,8 +1533,8 @@
  * Show and set the number of IGMP membership reports to send on link failure
  */
 static ssize_t bonding_show_resend_igmp(struct device *d,
-					 struct device_attribute *attr,
-					 char *buf)
+					struct device_attribute *attr,
+					char *buf)
 {
 	struct bonding *bond = to_bond(d);
 
@@ -1542,8 +1542,8 @@
 }
 
 static ssize_t bonding_store_resend_igmp(struct device *d,
-					  struct device_attribute *attr,
-					  const char *buf, size_t count)
+					 struct device_attribute *attr,
+					 const char *buf, size_t count)
 {
 	int new_value, ret = count;
 	struct bonding *bond = to_bond(d);
@@ -1555,7 +1555,7 @@
 		goto out;
 	}
 
-	if (new_value < 0) {
+	if (new_value < 0 || new_value > 255) {
 		pr_err("%s: Invalid resend_igmp value %d not in range 0-255; rejected.\n",
 		       bond->dev->name, new_value);
 		ret = -EINVAL;