drm/i915: make i915_seqno_passed non-static

We'll need it in i915_irq.c for checking whether there are outstanding
requests. Also, the function really ought to return a bool, not an int.

Signed-off-by: Ben Gamari <bgamari.foss@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/gpu/drm/i915/i915_gem.c

@@ -1671,7 +1671,7 @@ out:
 /**
  * Returns true if seq1 is later than seq2.
  */
-static int
+bool
 i915_seqno_passed(uint32_t seq1, uint32_t seq2)
 {
 	return (int32_t)(seq1 - seq2) >= 0;