Update example/linalg/example_solve_pcg.f90

Co-authored-by: Jeremie Vandenplas <[email protected]>

Author: jalvesz

example/linalg/example_solve_pcg.f90

@@ -6,7 +6,7 @@ program example_solve_pcg
     type(CSR_dp_type) :: laplacian_csr
     type(COO_dp_type) :: COO
     real(dp) :: laplacian(5,5)
-    real(dp) :: x(5), load(5)
+    real(dp) :: x(5), rhs(5)
     logical(1) :: dirichlet(5)
 
     laplacian = reshape( [1, -1,  0,  0,  0,&