drm/i915: Favor for_each_pipe() macro

Favor for_each_pipe() macro when looping through pipes.

v2: use 'enum pipe pipe' instead of 'i'
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NMika Kahola <mika.kahola@intel.com>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1507630626-23806-5-git-send-email-mika.kahola@intel.com

drivers/gpu/drm/i915/intel_pipe_crc.c

@@ -206,11 +206,11 @@ static const char *pipe_crc_source_name(enum intel_pipe_crc_source source)
 static int display_crc_ctl_show(struct seq_file *m, void *data)
 {
 	struct drm_i915_private *dev_priv = m->private;
-	int i;
+	enum pipe pipe;
 
-	for (i = 0; i < I915_MAX_PIPES; i++)
-		seq_printf(m, "%c %s\n", pipe_name(i),
-			   pipe_crc_source_name(dev_priv->pipe_crc[i].source));
+	for_each_pipe(dev_priv, pipe)
+		seq_printf(m, "%c %s\n", pipe_name(pipe),
+			   pipe_crc_source_name(dev_priv->pipe_crc[pipe].source));
 
 	return 0;
 }