Qnx: Avoid use of QtcProcess::ioDevice()

And drop the function from the QtcProcess interface, as this was the
only user.

Change-Id: I5a21cdaacb3f91f78058e80cbe1cb1572e9bf331
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/libs/utils/qtcprocess.cpp

@@ -779,11 +779,6 @@ QString QtcProcess::exitMessage()
     return QString();
 }
 
-QIODevice *QtcProcess::ioDevice()
-{
-    return d->m_process;
-}
-
 QByteArray QtcProcess::allRawOutput() const
 {
     if (!d->m_stdOut.rawData.isEmpty() && !d->m_stdErr.rawData.isEmpty()) {

src/libs/utils/qtcprocess.h

@@ -170,8 +170,6 @@ public:
     void closeWriteChannel();
     void close();
 
-    QIODevice *ioDevice(); // FIXME: Remove.
-
 signals:
     void started();
     void finished(int exitCode, QProcess::ExitStatus exitStatus);

src/plugins/qnx/qnxutils.cpp

@@ -127,10 +127,9 @@ EnvironmentItems QnxUtils::qnxEnvironmentFromEnvFile(const QString &fileName)
         return items;
 
     // parsing process output
-    QTextStream str(process.ioDevice());
-    while (!str.atEnd()) {
-        QString line = str.readLine();
-        int equalIndex = line.indexOf(QLatin1Char('='));
+    const QString output = process.stdOut();
+    for (const QString &line : output.split('\n')) {
+        int equalIndex = line.indexOf('=');
         if (equalIndex < 0)
             continue;
         QString var = line.left(equalIndex);