ws: Fix uninitialized variable
ws: Fix uninitialized variable

cockpit_json_get_string might not set it when handling malformed input.

Found by Coverity.

Closes #5973
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

dperpeet/cockpit,stefwalter/cockpit,mareklibra/cockpit,harishanand95/cockpit,martinpitt/cockpit,michalskrivanek/cockpit,garrett/cockpit,mareklibra/cockpit,xhad/cockpit,michalskrivanek/cockpit,mareklibra/cockpit,michalskrivanek/cockpit,andreasn/cockpit,dperpeet/cockpit,dperpeet/cockpit,Scribery/cockpit,larskarlitski/cockpit,stefwalter/cockpit,xhad/cockpit,mvollmer/cockpit,cockpituous/cockpit,larskarlitski/cockpit,dperpeet/cockpit,deryni/cockpit,mareklibra/cockpit,martinpitt/cockpit,Scribery/cockpit,andreasn/cockpit,martinpitt/cockpit,larskarlitski/cockpit,larskarlitski/cockpit,petervo/cockpit,larsu/cockpit,moraleslazaro/cockpit,Scribery/cockpit,harishanand95/cockpit,martinpitt/cockpit,cockpit-project/cockpit,deryni/cockpit,garrett/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,deryni/cockpit,harishanand95/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,Scribery/cockpit,garrett/cockpit,mareklibra/cockpit,michalskrivanek/cockpit,larsu/cockpit,SotolitoLabs/cockpit,larskarlitski/cockpit,xhad/cockpit,harishanand95/cockpit,cockpit-project/cockpit,SotolitoLabs/cockpit,cockpituous/cockpit,SotolitoLabs/cockpit,mvollmer/cockpit,larskarlitski/cockpit,xhad/cockpit,garrett/cockpit,petervo/cockpit,SotolitoLabs/cockpit,dperpeet/cockpit,andreasn/cockpit,petervo/cockpit,larsu/cockpit,petervo/cockpit,Scribery/cockpit,deryni/cockpit,cockpituous/cockpit,andreasn/cockpit,petervo/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,mvollmer/cockpit,harishanand95/cockpit,dperpeet/cockpit,cockpituous/cockpit,Scribery/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,michalskrivanek/cockpit,stefwalter/cockpit,larsu/cockpit,petervo/cockpit,stefwalter/cockpit,andreasn/cockpit,harishanand95/cockpit,Scribery/cockpit,xhad/cockpit,michalskrivanek/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,petervo/cockpit,xhad/cockpit,larskarlitski/cockpit,cockpituous/cockpit,mareklibra/cockpit,stefwalter/cockpit,andreasn/cockpit,garrett/cockpit,deryni/cockpit,larsu/cockpit,cockpit-project/cockpit,mvollmer/cockpit,deryni/cockpit,moraleslazaro/cockpit,harishanand95/cockpit,michalskrivanek/cockpit,cockpit-project/cockpit,xhad/cockpit,martinpitt/cockpit,dperpeet/cockpit,larsu/cockpit,deryni/cockpit