Remove Q_ASSERT's from large file autotest.

These assertions were made obsolete by the previous change to this test.

Change-Id: I3156b273a727f753a6c093c8fc7453b694c777ee
Task-number: QTBUG-17582
Reviewed-by: Rohan McGovern
(cherry picked from commit 57f6ed6664f55ccee62b81750a2b3520249503fd)

tests/auto/qfile/largefile/tst_largefile.cpp

@@ -160,13 +160,10 @@ static inline void appendRaw(QByteArray &array, T data)
  */
 static inline void topUpWith(QByteArray &array, QByteArray filler, int size)
 {
-    Q_ASSERT(filler.size() > 0);
-
     for (int i = (size - array.size()) / filler.size(); i > 0; --i)
         array.append(filler);
 
     if (array.size() < size) {
-        Q_ASSERT(size - array.size() < filler.size());
         array.append(filler.left(size - array.size()));
     }
 }
@@ -212,8 +209,6 @@ static inline QByteArray generateDataBlock(int blockSize, QString text, qint64 u
     appendRaw(block, userBits);
     appendRaw(block, randomBits);
 
-    Q_ASSERT( block.size() == blockSize );
-
     ++counter;
     return block;
 }