tools/kvm_stat: print error messages on faulty pid filter input

Print helpful messages in case users enter invalid input or invalid pids in
the interactive pid filter dialogue.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Reviewed-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
1 file changed