fix: check *ret instead of ret in xvasprintf error path#96
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ret is the address of a local char* and is never NULL, so the OOM branch was dead. Test len == -1 first to short-circuit, since per vasprintf(3) the contents of *strp are undefined on error on GNU; the *ret == NULL check then covers the FreeBSD case, where the implementation sets strp to NULL on error.
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retis the address of a localchar*and is never NULL, so the OOM branch was dead. Testlen == -1first to short-circuit, since pervasprintf(3)the contents of*strpare undefined on error on GNU; the*ret == NULLcheck then covers the FreeBSD case, where the implementation setsstrpto NULL on error.