interpolation warning fix

gistfile1.diff

diff --git a/src/common/interpolation.c b/src/common/interpolation.c
index 78b837e..ca24008 100644
--- a/src/common/interpolation.c
+++ b/src/common/interpolation.c
@@ -786,9 +786,9 @@ float dt_interpolation_compute_sample(const struct dt_interpolation *itor, const
       {
         int clip_x = clip(ix + j, 0, width - 1, bordermode);
         const float *ipixel = in + clip_y * linestride + clip_x * samplestride;
-        h += kernelh[j] * ipixel[0];
+        h += kernelh[j%8] * ipixel[0];
       }
-      s += kernelv[i] * h;
+      s += kernelv[i%8] * h;
     }
 
     r = s / (normh * normv);