drm/i915: drop unnecessary local variable to suppress build warning

Although I could not reproduce this (different compiler version,
perhaps), reportedly we get:

drivers/gpu/drm/i915/i915_irq.c:1943:27: warning: ‘score’ may be used
uninitialized in this function [-Wuninitialized]

Drop the 'score' variable altogether as it's not really needed.
Reported-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

@@ -1905,8 +1905,6 @@ static void i915_hangcheck_elapsed(unsigned long data)
 				} else
 					busy = false;
 			} else {
-				int score;
-
 				/* We always increment the hangcheck score
 				 * if the ring is busy and still processing
 				 * the same request, so that no single request
@@ -1927,20 +1925,18 @@ static void i915_hangcheck_elapsed(unsigned long data)
 
 				switch (ring->hangcheck.action) {
 				case HANGCHECK_WAIT:
-					score = 0;
 					break;
 				case HANGCHECK_ACTIVE:
-					score = BUSY;
+					ring->hangcheck.score += BUSY;
 					break;
 				case HANGCHECK_KICK:
-					score = KICK;
+					ring->hangcheck.score += KICK;
 					break;
 				case HANGCHECK_HUNG:
-					score = HUNG;
+					ring->hangcheck.score += HUNG;
 					stuck[i] = true;
 					break;
 				}
-				ring->hangcheck.score += score;
 			}
 		} else {
 			/* Gradually reduce the count so that we catch DoS