Corrected a bug in roots() for LaurentPolynomial.

Author: hurak

src/polynomials/LaurentPolynomial.jl

@@ -520,7 +520,7 @@ julia> roots(a)
 function  roots(p::P; kwargs...)  where  {T, P <: LaurentPolynomial{T}}
     c = coeffs(p)
     a = Polynomial(c,p.var)
-    return roots(p; kwargs...)
+    return roots(a; kwargs...)
 end
 
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