sw/vec_iree: Remove unused variable

This avoid warning for GCC compiler.

Change-Id: Iddc8dd35490597f0c8baa1972fe0d4f094f00a8c

risp4ml/isp_stages/gamma.c

diff --git a/risp4ml/isp_stages/gamma.c b/risp4ml/isp_stages/gamma.c
index 458e6a7..2b59c33 100644
--- a/risp4ml/isp_stages/gamma.c
+++ b/risp4ml/isp_stages/gamma.c
@@ -25,7 +25,6 @@
 static const uint8_t kGammaNumberSegments = 4;
 static const uint8_t kGammaLogSegmentOffsets[] = {0, 3, 2, 1};
 static const uint8_t kGammaLogSegmentSpacing[] = {8, 9, 10, 11};
-static const uint16_t kGammaLogNumberPoints[] = {5, 4, 4, 4};
 static const uint16_t kGammaSegmentLutOffset[] = {0, 32, 48, 64};
 
 static GammaParams gamma_params = {