[klibc] add '\n' only when needed in ./klibc/syslog.c

[Kay Sievers]

This patch adds the newline to the syslog() string only if it doesn't
already have one. It's annoying to get a second empty log line with
every syslog() call from code that has the newline by itself.

The syslog(3) man page states:
  "A trailing newline is added when needed."

Thanks,
Kay
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