tests/meson: do not reuse migration_files variable

The variable is defined in migration/meson.build, reusing it is confusing.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tests/qtest/meson.build

@@ -343,7 +343,7 @@ endif
 
 tpmemu_files = ['tpm-emu.c', 'tpm-util.c', 'tpm-tests.c']
 
-migration_files = [files(
+test_migration_files = [files(
   'migration/bootfile.c',
   'migration/framework.c',
   'migration/migration-qmp.c',
@@ -377,7 +377,7 @@ qtests = {
                              'migration/migration-util.c') + dbus_vmstate1,
   'erst-test': files('erst-test.c'),
   'ivshmem-test': [rt, '../../contrib/ivshmem-server/ivshmem-server.c'],
-  'migration-test': migration_files + migration_tls_files,
+  'migration-test': test_migration_files + migration_tls_files,
   'pxe-test': files('boot-sector.c'),
   'pnv-xive2-test': files('pnv-xive2-common.c', 'pnv-xive2-flush-sync.c',
                           'pnv-xive2-nvpg_bar.c'),
@@ -389,7 +389,7 @@ qtests = {
   'tpm-tis-i2c-test': [io, tpmemu_files, 'qtest_aspeed.c'],
   'tpm-tis-device-swtpm-test': [io, tpmemu_files, 'tpm-tis-util.c'],
   'tpm-tis-device-test': [io, tpmemu_files, 'tpm-tis-util.c'],
-  'virtio-net-failover': migration_files,
+  'virtio-net-failover': test_migration_files,
   'vmgenid-test': files('boot-sector.c', 'acpi-utils.c'),
   'netdev-socket': files('netdev-socket.c', '../unit/socket-helpers.c'),
 }