[PATCH libdrm] modetest: call drmModeCrtcSetGamma() only if add_property_optional returns true

[Rohit Visavalia]

gamma is a optional property then also it prints error message, so
set gamma only if add_property_optional() returns true.

Signed-off-by: Rohit Visavalia <rohit.visavalia at xilinx.com>
---
 tests/modetest/modetest.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c
index b907ab3..379b9ea 100644
--- a/tests/modetest/modetest.c
+++ b/tests/modetest/modetest.c
@@ -1138,7 +1138,7 @@ static void set_gamma(struct device *dev, unsigned crtc_id, unsigned fourcc)

        add_property_optional(dev, crtc_id, "DEGAMMA_LUT", 0);
        add_property_optional(dev, crtc_id, "CTM", 0);
-       if (!add_property_optional(dev, crtc_id, "GAMMA_LUT", blob_id)) {
+       if (add_property_optional(dev, crtc_id, "GAMMA_LUT", blob_id)) {
                uint16_t r[256], g[256], b[256];

                for (i = 0; i < 256; i++) {
--
2.7.4

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