Julia 1.12 / JET v0.10.7 warns that local variable `nadj` may be undefined

[penelopeysm]

Hello!

Running JET on SpecialFunctions.logabsgamma (or any function that calls it) leads to an error, specifically on Julia 1.12 and with JET v0.10.7:

julia> using SpecialFunctions, JET

julia> JET.test_call(SpecialFunctions._logabsgamma, (Float64,))
JET-test failed at /Users/pyong/.julia/packages/JET/OqLEC/src/JETBase.jl:1113
  Expression: (JET.report_call)(SpecialFunctions._logabsgamma, (Float64,))
  ═════ 1 possible error found ═════
  ┌ _logabsgamma(x::Float64) @ SpecialFunctions /Users/pyong/ppl/SpecialFunctions.jl/src/logabsgamma/e_lgamma_r.jl:173
  │ local variable `nadj` may be undefined: nadj::Float64
  └────────────────────

This occurs because of this line:

SpecialFunctions.jl/src/logabsgamma/e_lgamma_r.jl

Lines 172 to 174 in 1f0527c

	if isneg
	r = nadj - r
	end

I previously reported this on JET (aviatesk/JET.jl#749) and was directed here. The suggestion was to either merge the two if isneg sections (although I don't immediately see how to do this without a slight drop in performance), or to insert @assert @isdefined(nadj) at the bottom to tell the compiler that nadj exists.