IB: kmemdup() cleanup

Replace open coded kmemdup() to save some screen space, and allow
inlining/not inlining to be triggered by gcc.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/core/cm.c b/drivers/infiniband/core/cm.c
index 25b1018..82bc83b 100644
--- a/drivers/infiniband/core/cm.c
+++ b/drivers/infiniband/core/cm.c
@@ -240,11 +240,10 @@
 	if (!private_data || !private_data_len)
 		return NULL;
 
-	data = kmalloc(private_data_len, GFP_KERNEL);
+	data = kmemdup(private_data, private_data_len, GFP_KERNEL);
 	if (!data)
 		return ERR_PTR(-ENOMEM);
 
-	memcpy(data, private_data, private_data_len);
 	return data;
 }