Back in e2857b3d87306d93f0fba526f3e79f4f6806fb02 I added this function as static inline in order to avoid linking libmount into libshared. Nevertheless, a dependency on libmount was added to libbasic in 9e7f941acb0d8fe7a31eec7826ff2c9c6af7044f, and later moved to libshared in 77c772f227d866331560a8d0487fba12dd128dd4. So the shenanigan with an inline function is not useful, let's make it a normal function.
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