drm/i915/fdi: make intel_fdi_link_freq() return int

The unsigned doesn't help us here.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210823093645.10464-1-jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_fdi.c

@@ -95,7 +95,7 @@ static int ilk_check_fdi_lanes(struct drm_device *dev, enum pipe pipe,
 	}
 }
 
-u32 intel_fdi_link_freq(struct drm_i915_private *i915,
+int intel_fdi_link_freq(struct drm_i915_private *i915,
 			const struct intel_crtc_state *pipe_config)
 {
 	if (HAS_DDI(i915))

drivers/gpu/drm/i915/display/intel_fdi.h

@@ -6,15 +6,13 @@
 #ifndef _INTEL_FDI_H_
 #define _INTEL_FDI_H_
 
-#include <linux/types.h>
-
 struct drm_i915_private;
 struct intel_crtc;
 struct intel_crtc_state;
 struct intel_encoder;
 
 #define I915_DISPLAY_CONFIG_RETRY 1
-u32 intel_fdi_link_freq(struct drm_i915_private *i915,
+int intel_fdi_link_freq(struct drm_i915_private *i915,
 			const struct intel_crtc_state *pipe_config);
 int ilk_fdi_compute_config(struct intel_crtc *intel_crtc,
 			   struct intel_crtc_state *pipe_config);