drm/i915/dp: make link rate printing prettier

Turn

    [drm:intel_dp_print_rates] source rates: 162000,270000,540000,
    [drm:intel_dp_print_rates] sink rates: 162000,270000,
    [drm:intel_dp_print_rates] common rates: 162000,270000,

into

    [drm:intel_dp_print_rates] source rates: 162000, 270000, 540000
    [drm:intel_dp_print_rates] sink rates: 162000, 270000
    [drm:intel_dp_print_rates] common rates: 162000, 270000
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

@@ -1269,7 +1269,7 @@ static void snprintf_int_array(char *str, size_t len,
 	str[0] = '\0';
 
 	for (i = 0; i < nelem; i++) {
-		int r = snprintf(str, len, "%d,", array[i]);
+		int r = snprintf(str, len, "%s%d", i ? ", " : "", array[i]);
 		if (r >= len)
 			return;
 		str += r;