XRef: Move invariant GoffsetMax() out of loop

poppler/XRef.cc

diff --git a/poppler/XRef.cc b/poppler/XRef.cc
index 47291ed..851f39b 100644
--- a/poppler/XRef.cc
+++ b/poppler/XRef.cc
@@ -803,6 +803,7 @@
 bool XRef::readXRefStreamSection(Stream *xrefStr, const int *w, int first, int n)
 {
     unsigned long long offset, gen;
+    const unsigned long long offsetMax = GoffsetMax();
     int type, c, i, j;
 
     if (first > INT_MAX - n) {
@@ -838,7 +839,7 @@
             }
             offset = (offset << 8) + c;
         }
-        if (offset > static_cast<unsigned long long>(GoffsetMax())) {
+        if (offset > offsetMax) {
             error(errSyntaxError, -1, "Offset inside xref table too large for fseek");
             return false;
         }