Cannot use stop button for valgrind

Steps to reproduce:

• have a project open / configured and valgrind present
• start memcheck or callgrind from Debugger view
• use the Stop button on the Debugger toolbar to stop the application

Current result:

• app stops, but analyzing does never finish - this analyzer is now in a wrong state and will only work after restarting QC

Note: Using the close / exit stuff on the inferior itself works and results in correct analyzing / stopping the analyzer.