all: delete unused variables

Found by Daniel Martí.

Fixes gio#24

Signed-off-by: Elias Naur <mail@eliasnaur.com>

ui/app/internal/gpu/gpu.go

@@ -304,9 +304,8 @@ func (g *GPU) renderLoop(glctx gl.Context) error {
 				ops := frame.ops
 				// Upload path data to GPU before ack'ing the frame data for re-use.
 				for _, p := range ops.pathOps {
-					data, exists := g.pathCache.get(p.pathKey)
-					if !exists {
-						data = buildPath(r.ctx, p.pathVerts)
+					if _, exists := g.pathCache.get(p.pathKey); !exists {
+						data := buildPath(r.ctx, p.pathVerts)
 						g.pathCache.put(p.pathKey, data)
 					}
 					p.pathVerts = nil

ui/text/label.go

@@ -55,7 +55,7 @@ func (l *lineIterator) Next() (String, f32.Point, bool) {
 		l.prevDesc = line.Descent
 		// Align baseline and line start to the pixel grid.
 		off := fixed.Point26_6{X: fixed.I(x.Floor()), Y: fixed.I(l.y.Ceil())}
-		x, l.y = off.X, off.Y
+		l.y = off.Y
 		off.Y += fixed.I(l.Offset.Y)
 		if (off.Y + line.Bounds.Min.Y).Floor() > l.Clip.Max.Y {
 			break