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--- a/gzwrite.c 2010-01-18 21:18:27.000000000 +0100
+++ b/gzwrite.c 2010-01-28 04:37:20.330530306 +0100
@@ -435,7 +435,8 @@
state = (gz_statep)file;
/* check that we're writing and that there's no error */
- if (state->mode != GZ_WRITE|| state->err != Z_OK)
+ if (state->mode != GZ_WRITE || state->err != Z_OK)
+ return Z_STREAM_ERROR;
/* check flush parameter */
if (flush < 0 || flush > Z_FINISH)
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