v4l2: return NULL iso 0 for pointers

modules/access/v4l2.c

@@ -1301,7 +1301,7 @@ static block_t* GrabVideo( demux_t *p_demux )
         mtime_t i_dur = (mtime_t)((double)1000000 / (double)p_sys->f_fps);
 
         /* Did we wait long enough ? (frame rate reduction) */
-        if( p_sys->i_video_pts + i_dur > mdate() ) return 0;
+        if( p_sys->i_video_pts + i_dur > mdate() ) return NULL;
     }
 
     /* Grab Video Frame */
@@ -1314,18 +1314,18 @@ static block_t* GrabVideo( demux_t *p_demux )
             switch( errno )
             {
             case EAGAIN:
-                return 0;
+                return NULL;
             case EIO:
                 /* Could ignore EIO, see spec. */
                 /* fall through */
             default:
                 msg_Err( p_demux, "Failed to read frame" );
-                return 0;
+                return NULL;
                }
         }
 
         p_block = ProcessVideoFrame( p_demux, (uint8_t*)p_sys->p_buffers[0].start, i_ret );
-        if( !p_block ) return 0;
+        if( !p_block ) return NULL;
 
         break;
 
@@ -1340,19 +1340,19 @@ static block_t* GrabVideo( demux_t *p_demux )
             switch( errno )
             {
             case EAGAIN:
-                return 0;
+                return NULL;
             case EIO:
                 /* Could ignore EIO, see spec. */
                 /* fall through */
             default:
                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
-                return 0;
+                return NULL;
                }
         }
 
         if( buf.index >= p_sys->i_nbuffers ) {
             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
-            return 0;
+            return NULL;
         }
 
 //         msg_Err( p_demux, "New frame has size: %d (%d) %d",
@@ -1363,14 +1363,14 @@ static block_t* GrabVideo( demux_t *p_demux )
 #else
                                      p_sys->i_pitch * p_sys->i_height );
 #endif
-        if( !p_block ) return 0;
+        if( !p_block ) return NULL;
 
         /* Unlock */
         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
         {
             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
             block_Release( p_block );
-            return 0;
+            return NULL;
         }
 
         break;
@@ -1386,13 +1386,13 @@ static block_t* GrabVideo( demux_t *p_demux )
             switch( errno )
             {
             case EAGAIN:
-                return 0;
+                return NULL;
             case EIO:
                 /* Could ignore EIO, see spec. */
                 /* fall through */
             default:
                 msg_Err( p_demux, "Failed to wait (VIDIOC_DQBUF)" );
-                return 0;
+                return NULL;
             }
         }
 
@@ -1407,18 +1407,18 @@ static block_t* GrabVideo( demux_t *p_demux )
         if( i >= p_sys->i_nbuffers )
         {
             msg_Err( p_demux, "Failed capturing new frame as i>=nbuffers" );
-            return 0;
+            return NULL;
         }
 
         p_block = ProcessVideoFrame( p_demux, (uint8_t*)buf.m.userptr, buf.bytesused );
-        if( !p_block ) return 0;
+        if( !p_block ) return NULL;
 
         /* Unlock */
         if( v4l2_ioctl( p_sys->i_fd, VIDIOC_QBUF, &buf ) < 0 )
         {
             msg_Err( p_demux, "Failed to unlock (VIDIOC_QBUF)" );
             block_Release( p_block );
-            return 0;
+            return NULL;
         }
 
         break;
@@ -1439,13 +1439,13 @@ static block_t* ProcessVideoFrame( demux_t *p_demux, uint8_t *p_frame, size_t i_
 {
     block_t *p_block;
 
-    if( !p_frame ) return 0;
+    if( !p_frame ) return NULL;
 
     /* New block */
     if( !( p_block = block_New( p_demux, i_size ) ) )
     {
         msg_Warn( p_demux, "Cannot get new block" );
-        return 0;
+        return NULL;
     }
 
     /* Copy frame */