kernelshark: Add newline between perror and message in warning
kernelshark: Add newline between perror and message in warning

In showing a warning dialog, if errno exists, then add a new line
between the message and the errno message.

Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd