[PATCH] net: add description for len argument of dev_get_phys_port_name

When the function dev_get_phys_port_name was added it missed a description
for it's len argument. Adding it.

Fixes: db24a9044ee1 ("net: add support for phys_port_name")
Signed-off-by: Luis de Bethencourt <redacted>
---
Hi,

Noticed this when running make htmldocs. It gives the following warning:
.//net/core/dev.c:6453: warning: No description found for parameter 'len'

Thanks,
Luis

 net/core/dev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index 43c74ca..b9bcbe7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c

@@ -6445,6 +6445,7 @@ EXPORT_SYMBOL(dev_get_phys_port_id);
  *	dev_get_phys_port_name - Get device physical port name
  *	@dev: device
  *	@name: port name
+ *	@len: limit of bytes to copy to name
  *
  *	Get device physical port name
  */

-- 
2.6.4