Correct spelling error in zlib.h.
diff --git a/zlib.h b/zlib.h
index d6e81df..611d206 100644
--- a/zlib.h
+++ b/zlib.h
@@ -861,7 +861,7 @@
available input is skipped. No output is provided.
inflateSync searches for a 00 00 FF FF pattern in the compressed data.
- All full flush points have this pattern, but not all occurences of this
+ All full flush points have this pattern, but not all occurrences of this
pattern are full flush points.
inflateSync returns Z_OK if a possible full flush point has been found,
