staging: IB/ipath: use TASK_COMM_LEN in ipath_portdata

Use comm[TASK_COMM_LEN] instead of comm[16] in ipath_kernel.h.
And add sched.h header in it.
Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rdma/ipath/ipath_kernel.h

@@ -44,6 +44,7 @@
 #include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/scatterlist.h>
+#include <linux/sched.h>
 #include <asm/io.h>
 #include <rdma/ib_verbs.h>
 
@@ -162,7 +163,7 @@ struct ipath_portdata {
 	struct pid *port_pid;
 	struct pid *port_subpid[INFINIPATH_MAX_SUBPORT];
 	/* same size as task_struct .comm[] */
-	char port_comm[16];
+	char port_comm[TASK_COMM_LEN];
 	/* pkeys set by this use of this port */
 	u16 port_pkeys[4];
 	/* so file ops can get at unit */