Don't mangle errno with free(3) if utrace(2) fails
Don't mangle errno with free(3) if utrace(2) fails

This ensures POLA on FreeBSD (at least) as free(3) is generally assumed
to not fiddle around with errno.

Signed-off-by: Garrett Cooper <94c72ae9cb99b268ef5bac9a1283c7f5ad375547@gmail.com>

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