Fix possible undefined variable in NanoVG::textBounds

source/modules/dgl/src/NanoVG.cpp

@@ -863,7 +863,7 @@ float NanoVG::textBounds(float x, float y, const char* string, const char* end,
     if (fContext == nullptr) return 0.0f;
     DISTRHO_SAFE_ASSERT_RETURN(string != nullptr && string[0] != '\0', 0.0f);
 
-    float b[4];
+    float b[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
     const float ret = nvgTextBounds(fContext, x, y, string, end, b);
     bounds = Rectangle<float>(b[0], b[1], b[2] - b[0], b[3] - b[1]);
     return ret;