[REG 5.5 -> 5.6] QProcess overwrites error message from interpreter

Consider this script:

#!/no/such/file

Assume it is in a file called exe.sh. Now we call it from QProcess:

#include <QProcess>
#include <QtDebug>

int main()
{
    QProcess p;
    p.start("./exe.sh");
    p.waitForStarted();
    qDebug() << p.errorString();
}

Output from Qt 5.5:

No such file or directory

This comes from the system and gives the actual reason for the error.
Output from Qt 5.6 (current git HEAD):

Process failed to start

This is a generic error message that does not add anything to the information already available from QProcess' error type.
The likely culprit is commit 5147f73ac3.