Fix [a67252b384]: Memory leak when running the revised_text test suite. #604

Job	Run time
build (gcc)	2m 13s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	2m 4s
test (gcc)	4m 8s
build (gcc, --disable-shared)	1m 44s
test (gcc, --disable-xft)	4m 12s
build (gcc, --disable-xft)	1m 43s
test (gcc, --enable-symbols)	3m 35s
build (gcc, --disable-xss)	1m 50s
build (gcc, --enable-symbols)	1m 14s
build (clang)	1m 54s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 54s
build (clang, --disable-shared)	1m 55s
build (clang, --disable-xft)	1m 52s
build (clang, --disable-xss)	1m 55s
build (clang, --enable-symbols)	1m 26s
	33m 39s

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