typing error in mul.cpp

[Chris Dams]

Hello nice GiNaC people,

Could you please change the line

	for (its = ls.begin(), itr != lr.begin(); its != ls.end(); ++its, ++itr)

that occurs in the file mul.cpp in the function mul::algebraic_subs_mul
into

	for (its = ls.begin(), itr = lr.begin(); its != ls.end(); ++its, ++itr)

(i.e., remove an exclamation mark). This should give less segmentation
faults in my programs.

Bye,
Chris Dams