Cleanup: unused variable, redundant strlen call

source/blender/editors/mesh/editmesh_knife.cc

@@ -3593,7 +3593,6 @@ static bool knife_snap_angle_relative(KnifeTool_OpData *kcd)
   float curr_ray[3], curr_ray_normal[3];
   float curr_co[3], curr_cage[3]; /* Unused. */
 
-  float plane[4];
   float ray_hit[3];
   float lambda;
 

source/blender/editors/space_sequencer/sequencer_preview_draw.cc

@@ -556,8 +556,7 @@ static void draw_histogram(ARegion *region,
 
     /* Label. */
     char buf[10];
-    SNPRINTF(buf, "%.2f", val);
-    size_t buf_len = strlen(buf);
+    const size_t buf_len = SNPRINTF_RLEN(buf, "%.2f", val);
 
     float text_width, text_height;
     BLF_width_and_height(BLF_default(), buf, buf_len, &text_width, &text_height);