fix warning

Author: lrvideckis

tests/.config/.cppcheck_suppression_list

@@ -62,4 +62,3 @@ unusedFunction:../kactl/stress-tests/utilities/genTree.h:49
 containerOutOfBounds:../library/data_structures_[l,r)/uncommon/permutation_tree.hpp:85
 ctuOneDefinitionRuleViolation:../library/data_structures_[l,r)/bit.hpp:5
 ctuOneDefinitionRuleViolation:../library/data_structures_[l,r)/lazy_seg_tree.hpp:4
-shiftTooManyBits:../library/math/matrix_related/xor_basis_ordered.hpp:17

tests/library_checker_aizu_tests/math/xor_basis_intersection.test.cpp

@@ -36,7 +36,8 @@ int main() {
     int n;
     cin >> n;
     basis basis1;
-    basis_ordered<int> basis2;
+    basis_ordered<int> basis2; // to check that it compiles
+    assert(empty(basis2.b)); // remove unused var warning
     basis_ordered<ll> basis3;
     basis_ordered<bitset<lg>> basis4;
     for (int i = 0; i < n; i++) {
@@ -54,7 +55,7 @@ int main() {
     int m;
     cin >> m;
     basis basis5;
-    basis_ordered<int> basis6; // to check that it compiles
+    basis_ordered<int> basis6;
     basis_ordered<ll> basis7;
     basis_ordered<bitset<lg>> basis8;
     for (int j = 0; j < m; j++) {