small edit to sparsitystatus

Author: rayegun

src/options.jl

@@ -102,7 +102,7 @@ end
 Return the current sparsity of `A`, which is one of `Dense`,
 `Bitmap`, `Sparse`, or `Hypersparse`.
 """
-function sparsitystatus(A::AbstractGBArray)
+function sparsitystatus(A)
     wait(A) # We need to do this to ensure we're actually unpacking correctly.
     t = GBSparsity(gbget(A, SPARSITY_STATUS))
     return consttoshape(t)