Adding better error behavior to RS

Change-Id: Iea1cc76793f8978d60575404d7b1c5145e268d6e
diff --git a/libs/rs/driver/rsdMeshObj.cpp b/libs/rs/driver/rsdMeshObj.cpp
index 9ac6383..9a8c4d5 100644
--- a/libs/rs/driver/rsdMeshObj.cpp
+++ b/libs/rs/driver/rsdMeshObj.cpp
@@ -191,6 +191,7 @@
             case RS_PRIMITIVE_TRIANGLE:       mGLPrimitives[i] = GL_TRIANGLES; break;
             case RS_PRIMITIVE_TRIANGLE_STRIP: mGLPrimitives[i] = GL_TRIANGLE_STRIP; break;
             case RS_PRIMITIVE_TRIANGLE_FAN:   mGLPrimitives[i] = GL_TRIANGLE_FAN; break;
+            default: LOGE("Invalid mesh primitive"); break;
         }
     }
 }