Update shaders_mesh_instancing.c

adding a missing  'locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocationAttrib(shader, "instanceTransform");'

examples/shaders/shaders_mesh_instancing.c

@@ -73,7 +73,8 @@ int main(void)
     // Get shader locations
     shader.locs[SHADER_LOC_MATRIX_MVP] = GetShaderLocation(shader, "mvp");
     shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");
-
+    shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocationAttrib(shader, "instanceTransform");
+    
     // Set shader value: ambient light level
     int ambientLoc = GetShaderLocation(shader, "ambient");
     SetShaderValue(shader, ambientLoc, (float[4]){ 0.2f, 0.2f, 0.2f, 1.0f }, SHADER_UNIFORM_VEC4);