Update src/decompression.jl

Author: amontoison

src/decompression.jl

@@ -462,7 +462,7 @@ function decompress!(
     fill!(A, zero(eltype(A)))
 
     l = 0
-    rvS = rowvals(A)
+    rvS = rowvals(S)
     for j in axes(S, 2)
         for k in nzrange(S, j)
             i = rvS[k]