valgrind+afl: initialize cSize

Change-Id: Ia1b553fed82645023c28467b837b51bd959adbbe

vcl/source/filter/igif/gifread.cxx

@@ -214,16 +214,15 @@ void GIFReader::ReadPaletteEntries( BitmapPalette* pPal, sal_uLong nCount )
 
 bool GIFReader::ReadExtension()
 {
-    sal_uInt8   cFunction;
-    sal_uInt8   cSize;
-    sal_uInt8   cByte;
     bool    bRet = false;
     bool    bOverreadDataBlocks = false;
 
     // Extension-Label
+    sal_uInt8 cFunction(0);
     rIStm.ReadUChar( cFunction );
     if( NO_PENDING( rIStm ) )
     {
+        sal_uInt8 cSize(0);
         // Block length
         rIStm.ReadUChar( cSize );
 
@@ -232,12 +231,12 @@ bool GIFReader::ReadExtension()
             // 'Graphic Control Extension'
             case( 0xf9 ) :
             {
-                sal_uInt8 cFlags;
-
-                rIStm.ReadUChar( cFlags );
-                rIStm.ReadUInt16( nTimer );
-                rIStm.ReadUChar( nGCTransparentIndex );
-                rIStm.ReadUChar( cByte );
+                sal_uInt8 cFlags(0);
+                rIStm.ReadUChar(cFlags);
+                rIStm.ReadUInt16(nTimer);
+                rIStm.ReadUChar(nGCTransparentIndex);
+                sal_uInt8 cByte(0);
+                rIStm.ReadUChar(cByte);
 
                 if ( NO_PENDING( rIStm ) )
                 {
@@ -267,6 +266,7 @@ bool GIFReader::ReadExtension()
                         // NetScape-Extension
                         if( aAppId == "NETSCAPE" && aAppCode == "2.0" && cSize == 3 )
                         {
+                            sal_uInt8 cByte(0);
                             rIStm.ReadUChar( cByte );
 
                             // Loop-Extension
@@ -293,6 +293,7 @@ bool GIFReader::ReadExtension()
                         }
                         else if ( aAppId == "STARDIV " && aAppCode == "5.0" && cSize == 9 )
                         {
+                            sal_uInt8 cByte(0);
                             rIStm.ReadUChar( cByte );
 
                             // Loop extension