Fix typo in parameter name

A typo in a parameter name caused an inconsistency between declaration
and definition of a function.

src/streams/qtiocompressor.cpp

@@ -71,7 +71,7 @@ class QtIOCompressorPrivate {
     ~QtIOCompressorPrivate();
     void flushZlib(int flushMode);
     bool writeBytes(ZlibByte *buffer, ZlibSize outputSize);
-    void setZlibError(const QString &erroMessage, int zlibErrorCode);
+    void setZlibError(const QString &errorMessage, int zlibErrorCode);
 
     QIODevice *device;
     bool manageDevice;