glx: Do not flood with warnings when reducing during config lookup

With things like sample count reducing a format (16 -> 8 -> 4 -> ...)
and trying again is perfectly fine. There is no need to show warnings
in this case. Even some of our own examples in qtdeclarative do a
setSamples(16) which is rarely supported. These all show warnings since
8ec98fc2dc40237730f99af099dffe2920ef5bcc. Avoid this.

Change-Id: Ice83d5720b02e92f77cfd63918c98ad222513b6a
Reviewed-by: Christian Strømme <christian.stromme@qt.io>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/platformsupport/glxconvenience/qglxconvenience.cpp b/src/platformsupport/glxconvenience/qglxconvenience.cpp
index 6bd73de8f3..ef413ba98d 100644
--- a/src/platformsupport/glxconvenience/qglxconvenience.cpp
+++ b/src/platformsupport/glxconvenience/qglxconvenience.cpp
@@ -258,9 +258,11 @@ GLXFBConfig qglx_findConfig(Display *display, int screen , QSurfaceFormat format
             qCDebug(lcGlx) << "qglx_findConfig: Found non-matching but compatible FBConfig";
             return compatibleCandidate;
         }
-        qCWarning(lcGlx, "qglx_findConfig: Failed to finding matching FBConfig (%d %d %d %d)", requestedRed, requestedGreen, requestedBlue, requestedAlpha);
     } while (qglx_reduceFormat(&format));
 
+    if (!config)
+        qCWarning(lcGlx) << "qglx_findConfig: Failed to finding matching FBConfig for" << format;
+
     return config;
 }