avfilter/vf_v360: remove uneeded array element

libavfilter/v360.h

@@ -121,7 +121,7 @@ typedef struct V360Context {
     int in_transpose, out_transpose;
 
     float h_fov, v_fov, d_fov;
-    float flat_range[3];
+    float flat_range[2];
 
     float rot_mat[3][3];
 

libavfilter/vf_v360.c

@@ -1918,7 +1918,6 @@ static int prepare_flat_out(AVFilterContext *ctx)
 
     s->flat_range[0] = tanf(h_angle);
     s->flat_range[1] = tanf(v_angle);
-    s->flat_range[2] = -1.f;
 
     return 0;
 }
@@ -1939,11 +1938,10 @@ static void flat_to_xyz(const V360Context *s,
 {
     const float l_x =  s->flat_range[0] * (2.f * i / width  - 1.f);
     const float l_y = -s->flat_range[1] * (2.f * j / height - 1.f);
-    const float l_z =  s->flat_range[2];
 
     vec[0] =  l_x;
     vec[1] =  l_y;
-    vec[2] = l_z;
+    vec[2] = -1.f;
 
     normalize_vector(vec);
 }