fix undefined res and spzeros

Author: jClugstor

lib/OrdinaryDiffEqDifferentiation/src/OrdinaryDiffEqDifferentiation.jl

@@ -13,7 +13,7 @@ using DiffEqBase
 import LinearAlgebra
 import LinearAlgebra: Diagonal, I, UniformScaling, diagind, mul!, lmul!, axpby!, opnorm, lu
 import LinearAlgebra: LowerTriangular, UpperTriangular
-import SparseArrays: SparseMatrixCSC, AbstractSparseMatrix, nonzeros, sparse
+import SparseArrays: SparseMatrixCSC, AbstractSparseMatrix, nonzeros, sparse, spzeros
 import ArrayInterface
 
 import StaticArrayInterface

lib/OrdinaryDiffEqDifferentiation/src/operators.jl

@@ -43,8 +43,7 @@ function JVPCache(f::DiffEqBase.AbstractDiffEqFunction, du, u, p, t; autodiff)
 end
 
 function (op::JVPCache)(v, u, p, t)
-    op.jvp_op(op.du, v, u, p, t)
-    return res
+    return op.jvp_op(op.du, v, u, p, t) 
 end
 
 function (op::JVPCache)(Jv, v, u, p, t)