pipeline: Add a missing break for the uniforms state

_cogl_pipeline_init_multi_property_sparse_state was missing a break in
the case statement handling uniforms. This doesn't yet matter because
it is the last one handled anyway but it will bite someone later.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

cogl/cogl-pipeline.c

@@ -1064,6 +1064,7 @@ _cogl_pipeline_init_multi_property_sparse_state (CoglPipeline *pipeline,
         _cogl_bitmask_init (&uniforms_state->override_mask);
         _cogl_bitmask_init (&uniforms_state->changed_mask);
         uniforms_state->override_values = NULL;
+        break;
       }
     }
 }