Don't try to unbreak non-broken feature data

Apparently android's simpleperf doesn't contain the HOSTNAME feature.
Yet the data is still valid - trying to unbreak it would actually
break it for real.

Fixes: KDAB/hotspot#224
Change-Id: I0ed694a79fc731728edee8f6e2e3ba52717e2ea4
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

app/perfheader.cpp

@@ -81,13 +81,13 @@ void PerfHeader::read()
         for (uint i = 0; i < featureParts; ++i)
             stream >> m_features[i];
 
-        if (m_magic == s_magicSwitched && !hasFeature(HOSTNAME)) {
+        if (m_magic == s_magicSwitched && !hasFeature(HOSTNAME) && !hasFeature(CMDLINE)) {
 
             quint32 *features32 = reinterpret_cast<quint32 *>(&m_features[0]);
             for (uint i = 0; i < featureParts; ++i)
                 qSwap(features32[i * 2], features32[i * 2 + 1]);
 
-            if (!hasFeature(HOSTNAME)) {
+            if (!hasFeature(HOSTNAME) && !hasFeature(CMDLINE)) {
                 // It borked: blank it all
                 qWarning() << "bad feature data:" << m_features;
                 for (uint i = 0; i < featureParts; ++i)