[PATCH] missing include in infiniband

[Al Viro]

	use of IS_ERR/PTR_ERR in infiniband/core/agent.c, without
a portable chain of includes pulling err.h (breaks on a bunch of
platforms).
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
----
diff -urN RC14-base/drivers/infiniband/core/agent.h current/drivers/infiniband/core/agent.h
--- RC14-base/drivers/infiniband/core/agent.h	2005-10-28 22:35:58.000000000 -0400
+++ current/drivers/infiniband/core/agent.h	2005-10-29 01:25:34.000000000 -0400
@@ -39,6 +39,7 @@
 #ifndef __AGENT_H_
 #define __AGENT_H_
 
+#include <linux/err.h>
 #include <rdma/ib_mad.h>
 
 extern int ib_agent_port_open(struct ib_device *device, int port_num);
-
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