refactoring - it is save to free/delete a null pointer

use DELETENULL where appropriate

4 files changed, 11 insertions, 32 deletions

diff --git a/ttxtsubs.c b/ttxtsubs.c
index 9ace1ad..0927b0d 100644
--- a/ttxtsubs.c
+++ b/ttxtsubs.c
@@ -24,6 +24,7 @@
 #include <vdr/menuitems.h>
 #include <vdr/thread.h>
 #include <vdr/config.h>
+#include <vdr/tools.h>
 #include <semaphore.h>
 
 #define TIMEMEASURE 0
@@ -523,12 +524,8 @@ void cPluginTtxtsubs::StopTtxt(void)
 {
   //dprint("cPluginTtxtsubs::StopTtxt\n");
 
-  if(mDispl) {
-    cTtxtSubsDisplayer *d = mDispl;
-    HideTtxt();
-    mDispl = NULL;
-    delete d; // takes 0.03-0.04 s
-  }
+  HideTtxt();
+  DELETENULL(mDispl); // takes 0.03-0.04 s
 }
 
 void cPluginTtxtsubs::ShowTtxt(void)
diff --git a/ttxtsubsdisplay.c b/ttxtsubsdisplay.c
index 3f49cb9..481d82b 100644
--- a/ttxtsubsdisplay.c
+++ b/ttxtsubsdisplay.c
@@ -30,6 +30,7 @@
 #include <vdr/thread.h>
 #include <vdr/font.h>
 #include <vdr/config.h>
+#include <vdr/tools.h>
 
 #include "ttxtsubsglobals.h"
 #include "ttxtsubsdisplay.h"
@@ -106,13 +107,8 @@ cTtxtSubsDisplay::cTtxtSubsDisplay(void)
 
 cTtxtSubsDisplay::~cTtxtSubsDisplay(void)
 {
-  if(mLastDataTime)
-    free(mLastDataTime);
-  if(mOsd) {
-    cOsd* tmp = mOsd;
-    mOsd = NULL;
-    delete tmp;
-  }
+  free(mLastDataTime);
+  delete mOsd;
   if(mOsdFont && (mOsdFont != cFont::GetFont(fontOsd)))
     delete mOsdFont;
 }
@@ -395,11 +391,7 @@ void cTtxtSubsDisplay::ShowOSD(void)
 	rowcount++;
   }
 
-  if(mOsd) {
-    cOsd* tmp = mOsd;
-    mOsd = NULL;
-    delete tmp;
-  }
+  DELETENULL(mOsd);
 
      mOsd = cOsdProvider::NewOsd(SCREENLEFT, SCREENTOP, 20); // level 20
      if(!mOsd) {
@@ -507,9 +499,5 @@ void cTtxtSubsDisplay::ClearOSD(void)
   cOSDSelfMemoryLock selfmem(&gSelfMem);
   cMutexLock lock(&mOsdLock);
 
-  if(mOsd) {
-    cOsd* tmp = mOsd;
-    mOsd = NULL;
-    delete tmp;
-  }
+  DELETENULL(mOsd);
 }
diff --git a/ttxtsubsdisplayer.c b/ttxtsubsdisplayer.c
index ffec39c..8aab453 100644
--- a/ttxtsubsdisplayer.c
+++ b/ttxtsubsdisplayer.c
@@ -48,11 +48,7 @@ cTtxtSubsDisplayer::~cTtxtSubsDisplayer(void)
   mGetCond.Broadcast();
   this->Cancel(5);
 
-  if(mDisp) {
-    cTtxtSubsDisplay *tmp = mDisp;
-    mDisp = NULL;
-    delete tmp;
-  }
+  delete mDisp;
 }
 
 // handled messages in ring buffer - runs in a thread of its own
diff --git a/ttxtsubsfilter.c b/ttxtsubsfilter.c
index ecfd170..3dff56f 100644
--- a/ttxtsubsfilter.c
+++ b/ttxtsubsfilter.c
@@ -103,10 +103,8 @@ void cTtxtSubsFilter::FreePages(void)
 {
   mCount = 0;
 
-  if(mPages) {
-    free(mPages);
-    mPages = NULL;
-  }
+  free(mPages);
+  mPages = NULL;
 }