The default newlib read/write syscalls automatically convert newline
endings from LF to CRLF on stdout. Therefore, the test should not
specifically check for LF in the expected output, as the standard
conversion for stdout is CRLF. While it is possible to change the
expected line ending in the test from LF to CRLF, it seems more
dependable to just avoid verifying line endings entirely.
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>