drm/i915/dsi: s/size_t/int/

This fixes a printf warn from gcc:

drivers/gpu/drm/i915/intel_dsi_cmd.c: In function ‘dsi_vc_send_long’:
drivers/gpu/drm/i915/intel_dsi_cmd.c:181:2: warning: format ‘%x’ expects argument of type ‘unsigned int’, but argument 7 has type ‘size_t’ [-Wformat=]

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_dsi_cmd.h b/drivers/gpu/drm/i915/intel_dsi_cmd.h
index 714a49a..54c8a23 100644
--- a/drivers/gpu/drm/i915/intel_dsi_cmd.h
+++ b/drivers/gpu/drm/i915/intel_dsi_cmd.h
@@ -36,16 +36,16 @@
 void dsi_hs_mode_enable(struct intel_dsi *intel_dsi, bool enable);
 
 int dsi_vc_dcs_write(struct intel_dsi *intel_dsi, int channel,
-		     const u8 *data, size_t len);
+		     const u8 *data, int len);
 
 int dsi_vc_generic_write(struct intel_dsi *intel_dsi, int channel,
-			 const u8 *data, size_t len);
+			 const u8 *data, int len);
 
 int dsi_vc_dcs_read(struct intel_dsi *intel_dsi, int channel, u8 dcs_cmd,
-		    u8 *buf, size_t buflen);
+		    u8 *buf, int buflen);
 
 int dsi_vc_generic_read(struct intel_dsi *intel_dsi, int channel,
-			u8 *reqdata, size_t reqlen, u8 *buf, size_t buflen);
+			u8 *reqdata, int reqlen, u8 *buf, int buflen);
 
 int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd);
 
@@ -84,21 +84,21 @@
 
 /* XXX: questionable read helpers */
 static inline int dsi_vc_generic_read_0(struct intel_dsi *intel_dsi,
-					int channel, u8 *buf, size_t buflen)
+					int channel, u8 *buf, int buflen)
 {
 	return dsi_vc_generic_read(intel_dsi, channel, NULL, 0, buf, buflen);
 }
 
 static inline int dsi_vc_generic_read_1(struct intel_dsi *intel_dsi,
 					int channel, u8 param, u8 *buf,
-					size_t buflen)
+					int buflen)
 {
 	return dsi_vc_generic_read(intel_dsi, channel, &param, 1, buf, buflen);
 }
 
 static inline int dsi_vc_generic_read_2(struct intel_dsi *intel_dsi,
 					int channel, u8 param1, u8 param2,
-					u8 *buf, size_t buflen)
+					u8 *buf, int buflen)
 {
 	u8 req[2] = { param1, param2 };