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[Patch] Testcase for vfprintf bug


I've recently had the need to review glibc's vfprintf code. During the process I discovered that no testcase for bug #13446 was ever installed.

The original testcase in #13446 utilizes the printf hooks mechanism; the system where I needed the problem fixed & tested pre-dates printf hooks, so I mangled the existing stdio-common/bug23.c test to expose the memory allocation bug in #13446.

OK to install?

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