Fix tautologies in calibfilter.cpp which cause a build failure when using -Werror=address with clang-3.5

http://code.opencv.org/issues/4048

Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>

modules/legacy/src/calibfilter.cpp

@@ -95,11 +95,8 @@ bool CvCalibFilter::SetEtalon( CvCalibEtalonType type, double* params,
 
     Stop();
 
-    if (latestPoints != NULL)
-    {
     for( i = 0; i < MAX_CAMERAS; i++ )
         cvFree( latestPoints + i );
-    }
 
     if( type == CV_CALIB_ETALON_USER || type != etalonType )
     {
@@ -523,8 +520,6 @@ void CvCalibFilter::DrawPoints( CvMat** dstarr )
         return;
     }
 
-    if( latestCounts )
-    {
     for( i = 0; i < cameraCount; i++ )
     {
         if( dstarr[i] && latestCounts[i] )
@@ -583,7 +578,6 @@ void CvCalibFilter::DrawPoints( CvMat** dstarr )
             }
         }
     }
-    }
 }