Unique solution / Prevent certain solution

How do I suppress the solution of the zero vector in the linear solver to achieve a unique solution as [1;1] for example?

function [ e ] = eigenvector( A )

A=[2 -1;-1 2]; % Matrix A
syms lam; % symb Variable lamda

%Return

lam=solve(charpoly(A,lam),lam);

for i=1:length(lam)
EV(i,:)=double(linsolve((A-lam(i)*eye(length(lam))),[0;0]));
disp([num2str(i),'. EV: ',num2str(EV(i))])
end
end