Index: generic/nsfError.c
===================================================================
diff -u -N -rba23ab58bc8dd8018eb4de475a104619abc8a128 -rf8ec7669fbc2d051a3b33721a1046677935f0594
--- generic/nsfError.c	(.../nsfError.c)	(revision ba23ab58bc8dd8018eb4de475a104619abc8a128)
+++ generic/nsfError.c	(.../nsfError.c)	(revision f8ec7669fbc2d051a3b33721a1046677935f0594)
@@ -78,7 +78,7 @@
   failure = (result == -1 && errno == ERANGE);
 #else
   assert(result > -1);
-  failure = (result > avail);
+  failure = (result >= avail);
 #endif
 
   if (likely(failure == 0)) {