tools/kvm_stat: print error on invalid regex
Entering an invalid regular expression did not produce any indication of an error so far. To reproduce, press 'f' and enter 'foo(' (with an unescaped bracket). Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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