Backport rev. 55783:
Patch by Tim Delany (missing DECREF). SF #1731330.
diff --git a/Modules/_sqlite/cache.c b/Modules/_sqlite/cache.c
index 6962695..83ef705 100644
--- a/Modules/_sqlite/cache.c
+++ b/Modules/_sqlite/cache.c
@@ -243,6 +243,7 @@
         }
         template = PyString_FromString("%s <- %s ->%s\n");
         if (!template) {
+            Py_DECREF(fmt_args);
             return NULL;
         }
         display_str = PyString_Format(template, fmt_args);