ring-buffer: Always inline rb_event_data()

The rb_event_data() is the fast path of getting the ring buffer data from an
event. Externally, ring_buffer_event_data() is used to access this function.
But unfortunately, rb_event_data() is not inlined, and calling
ring_buffer_event_data() causes that function to be called again. Force
rb_event_data() to be inlined to lower the number of operations needed when
calling ring_buffer_event_data().

Link: http://lkml.kernel.org/r/[email protected]

Reported-by: Andi Kleen <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>

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