drm/i915: Fix error code in icl_compute_combo_phy_dpll()

This function is supposed to return zero or negative error codes but it
accidentally returns true on failure.

Fixes: 92a02074 ("drm/i915: Split shared dpll .get_dplls() into compute and get phases")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/YrVcHArNMTGCSy+9@kiliReviewed-by: NJosé Roberto de Souza <jose.souza@intel.com>

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

@@ -3184,7 +3184,7 @@ static int icl_compute_combo_phy_dpll(struct intel_atomic_state *state,
 	struct icl_port_dpll *port_dpll =
 		&crtc_state->icl_port_dplls[ICL_PORT_DPLL_DEFAULT];
 	struct skl_wrpll_params pll_params = {};
-	bool ret;
+	int ret;
 
 	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI) ||
 	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))