[I/OAT]: net/core/user_dma.c should #include <net/netdma.h>

Every file should #include the headers containing the prototypes for
its global functions.

Especially in cases like this one where gcc can tell us through a
compile error that the prototype was wrong...

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/user_dma.c b/net/core/user_dma.c
index b7c98db..248a6b6 100644
--- a/net/core/user_dma.c
+++ b/net/core/user_dma.c
@@ -29,6 +29,7 @@
 #include <linux/socket.h>
 #include <linux/rtnetlink.h> /* for BUG_TRAP */
 #include <net/tcp.h>
+#include <net/netdma.h>
 
 #define NET_DMA_DEFAULT_COPYBREAK 4096