HFI1: Range-check proc->fd_priv_table[]

sockioctl01.c in LTP calls ioctl(1025, ...) and causes kernel page-fault without
the range-check.

Change-Id: I4117783e20107f274c0857b09745f12a5cc5ce2f

kernel/include/process.h

@@ -578,7 +578,8 @@ struct process {
 	int nr_processes; /* For partitioned execution */
 	int process_rank; /* Rank in partition */
 
-	void *fd_priv_table[256];
+#define MAX_FD_PRIV 256
+	void *fd_priv_table[MAX_FD_PRIV];
 	/* HFI1 specific */
 	void *hfi1_kregbase;
 	void *hfi1_piobase;