Delete excess white-space

Author: oxinabox

src/differentials/composite.jl

@@ -77,7 +77,6 @@ backing(x::Tuple) = x
 backing(x::NamedTuple) = x
 backing(x::Composite) = getfield(x, :backing)
 
-
 function backing(x::T)::NamedTuple where T
     # note: all computation outside the if @generated happens at runtime.
     # so the first 4 lines of the branchs look the same, but can not be moved out.