kernel-shark: Better error message for the constructor of KsCaptureControl

The error message includes the case when the tracing directory cannot be
found or mounted.

Link: http://lore.kernel.org/linux-trace-devel/20190723125204.22799-3-y.karadz@gmail.com

Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
1 file changed