fix gcc-11 compile errors

Author: Martin Dummer

noad.cpp

@@ -1587,7 +1587,7 @@ int scanRecord( int iNumFrames, cMarks *_marks )
   #ifndef VNOAD
   // open the record
   cfn = new cFileName(filename, false, false, isPES);
-  if( cfn->Open() < 0 )
+  if( cfn->Open() == NULL )
   {
     delete cfn;
     delete cIF;

noaddata.cpp

@@ -361,7 +361,7 @@ void noadData::setYUVGreyCorners()
    int topend = m_nBorderYTop+m_nSizeY;
    int bottStart = m_nGrabHeight-m_nBorderYBot-m_nSizeY;
    int bottEnd = m_nGrabHeight-m_nBorderYBot;
-   register int linestart;
+   int linestart;
    int rightLogoOffset = m_nGrabWidth-m_nBorderX-m_nSizeX;
    uint8_t *bufstart = nyuvbuf->buf[0];
    int linewidth0 = nyuvbuf->linewidth[0];
@@ -1047,10 +1047,10 @@ void noadData::getHistogram(simpleHistogram &dest)
 {
    unsigned char *frame_ptr = (unsigned char *)nyuvbuf->buf[0];
   memset(dest, 0, sizeof(simpleHistogram));
-  for(register int y = 0; y < m_nGrabHeight; y += 2 )
+  for(int y = 0; y < m_nGrabHeight; y += 2 )
   {
       int linestart = y * nyuvbuf->linewidth[0];
-    for(register int x = 0; x < m_nGrabWidth; x += 2 )
+    for(int x = 0; x < m_nGrabWidth; x += 2 )
       dest[frame_ptr[linestart + x]]++;
   }
 }
@@ -1059,7 +1059,7 @@ bool noadData::areSimilar(simpleHistogram &hist1,simpleHistogram &hist2)
 {
   long similar = 0;
 
-  for(register int i = 0; i < 256; i++)
+  for(int i = 0; i < 256; i++)
   {
     if (hist1[i] < hist2[i])
       similar += hist1[i];

showindex.cpp

@@ -33,7 +33,7 @@ int doShowIndex(const char * filename)
   cfn = new cFileName(filename, false, false, isPES);
   //cfn = new cFileName(filename, false);
   fprintf(stdout,"try to open %s\n",cfn->Name());
-  if( cfn->Open() < 0 )
+  if( cfn->Open() == NULL )
   {
     fprintf(stdout,"opening %s failed\n",cfn->Name());
     delete cIF;

tnoad.cpp

@@ -422,7 +422,7 @@ int doOnlineScan(noadData *thedata, const char *fName, cMarks *_marks )
   #ifndef VNOAD
   // open the record
   cfn = new cFileName(filename, false, false, isPES );
-  if( cfn->Open() < 0 )
+  if( cfn->Open() == NULL )
   {
     delete cfn;
     delete cIF;

tools.cpp

@@ -72,7 +72,7 @@ void writechar(int filedes, char c)
 char *readline(FILE *f)
 {
   static char buffer[MAXPARSEBUFFER];
-  if (fgets(buffer, sizeof(buffer), f) > 0)
+  if (fgets(buffer, sizeof(buffer), f) != NULL)
   {
     int l = strlen(buffer) - 1;
     if (l >= 0 && buffer[l] == '\n')

vdr_cl.cpp

@@ -173,7 +173,7 @@ cUnbufferedFile *cFileName::SetOffset(int Number, off_t Offset)
            }
         // found a non existing file suffix
         }
-     if (Open() >= 0) {
+     if (Open() != NULL) {
         if (!record && Offset >= 0 && file && file->Seek(Offset, SEEK_SET) != Offset) {
            LOG_ERROR_STR(fileName);
            return NULL;
@@ -663,7 +663,7 @@ cNoadIndexFile::~cNoadIndexFile()
 
 bool cNoadIndexFile::Get(int Index, uint16_t *FileNumber, off_t *FileOffset, bool *Independent, int *Length)
 {
-  if (index >= 0)
+  if (index != NULL)
   {
      if (Index >= 0 && Index < last) 
 	  {
@@ -2128,7 +2128,7 @@ char *cReadLine::Read(FILE *f)
 {
   static char buffer[MAXPARSEBUFFER];
   char *cp = fgets(buffer, sizeof(buffer), f);
-  if (cp > 0) 
+  if (cp != NULL)
   {
      int n = strlen(cp);
      if (buffer[n] == '\n')