drivers: gpu: drm: i915: intel_fifo_underrun.c: Fix a typo in comment

The comment for intel_cpu_fifo_underrun_irq_handler() is not consistent
with the code and the rest of the comment for this routine. This patch
fixes this typo in comment.
Signed-off-by: Kumar Amit Mehta <gmate.amit@gmail.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_fifo_underrun.c

@@ -341,7 +341,7 @@ bool intel_set_pch_fifo_underrun_reporting(struct drm_i915_private *dev_priv,
 }
 
 /**
- * intel_pch_fifo_underrun_irq_handler - handle PCH fifo underrun interrupt
+ * intel_cpu_fifo_underrun_irq_handler - handle CPU fifo underrun interrupt
  * @dev_priv: i915 device instance
  * @pipe: (CPU) pipe to set state for
  *