msi/tests: Add missing '\n' to ok() call.

dlls/msi/tests/db.c

diff --git a/dlls/msi/tests/db.c b/dlls/msi/tests/db.c
index 1d24f5d..9f98540 100644
--- a/dlls/msi/tests/db.c
+++ b/dlls/msi/tests/db.c
@@ -1265,7 +1265,7 @@
     memset(buf, 0, MAX_PATH);
     r = MsiRecordReadStream( rec, 2, buf, &size );
     ok( r == ERROR_SUCCESS, "Failed to get stream: %d\n", r);
-    ok( !lstrcmp(buf, "test.txt\n"), "Expected 'test.txt\\n', got %s", buf);
+    ok( !lstrcmp(buf, "test.txt\n"), "Expected 'test.txt\\n', got %s\n", buf);
 
     MsiCloseHandle( rec );