coverity#735344 Unchecked return value from library

Change-Id: I6dbb5ce74225e092d4098174fd4b53aa8c4201fa

1 files changed, 7 insertions, 4 deletions

diff --git a/vcl/source/fontsubset/cff.cxx b/vcl/source/fontsubset/cff.cxx
index 1bb6f06f437f..1d22d09ea9af 100644
--- a/vcl/source/fontsubset/cff.cxx
+++ b/vcl/source/fontsubset/cff.cxx
@@ -1778,11 +1778,14 @@ size_t Type1Emitter::updateLen( int nTellPos, size_t nLength)
     cData[1] = static_cast<U8>(nLength >>  8);
     cData[2] = static_cast<U8>(nLength >> 16);
     cData[3] = static_cast<U8>(nLength >> 24);
-    const long nCurrPos = ftell( mpFileOut);
-    fseek( mpFileOut, nTellPos, SEEK_SET);
-    size_t nWrote = fwrite( cData, 1, sizeof(cData), mpFileOut);
+    const long nCurrPos = ftell(mpFileOut);
+    if (nCurrPos < 0)
+        return 0;
+    if (fseek( mpFileOut, nTellPos, SEEK_SET) != 0)
+        return 0;
+    size_t nWrote = fwrite(cData, 1, sizeof(cData), mpFileOut);
     if( nCurrPos >= 0)
-        fseek( mpFileOut, nCurrPos, SEEK_SET);
+        (void)fseek(mpFileOut, nCurrPos, SEEK_SET);
     return nWrote;
 }