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>From musl 0.9.14 (to the latest version 1.2.3), both sbrk() and brk() have almost been disabled for they conflict with malloc, only sbrk(0) is still permitted as a way to get the current location of the program break, let's support such case. EXPECT_PTRNE() is used to expect sbrk() always successfully getting the current break. Signed-off-by: Zhangjin Wu <falcon@tinylab.org> Signed-off-by: Willy Tarreau <w@1wt.eu>