fix return in addmul!

[felix-roehrich]

Dispatches of addmul! returned different values depending on type. The returned value is now uniform for all dispatches.

[lgoettgens]

Thanks for the change! These are now consistent with the other methods, e.g.

Nemo.jl/src/flint/fmpz.jl

Lines 2619 to 2623 in f89c878

	function addmul!(z::ZZRingElem, x::ZZRingElem, y::ZZRingElem)
	ccall((:fmpz_addmul, libflint), Nothing,
	(Ref{ZZRingElem}, Ref{ZZRingElem}, Ref{ZZRingElem}), z, x, y)
	return z
	end

[codecov]

Codecov Report

Merging #1541 (aba78cb) into master (f89c878) will increase coverage by 0.24%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1541      +/-   ##
==========================================
+ Coverage   83.79%   84.03%   +0.24%     
==========================================
  Files          94       94              
  Lines       36610    36613       +3     
==========================================
+ Hits        30678    30769      +91     
+ Misses       5932     5844      -88     

Files	Coverage Δ
src/arb/arb.jl	88.30% <0.00%> (+0.44%)	⬆️
src/flint/fmpz_mat.jl	89.55% <0.00%> (ø)

... and 19 files with indirect coverage changes

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[thofma]

Merci