Ignore chmod() return value.
Only other option would be to let zip_commit fail, and I find that
too heavy-handed.
Silences Coverity warning.

lib/zip_source_filep.c

diff --git a/lib/zip_source_filep.c b/lib/zip_source_filep.c
index 0832724..3d94ca4 100644
--- a/lib/zip_source_filep.c
+++ b/lib/zip_source_filep.c
@@ -237,7 +237,8 @@
             }
 	    mask = umask(022);
 	    umask(mask);
-	    chmod(ctx->fname, 0666&~mask);
+	    /* not much we can do if chmod fails except make the whole commit fail */
+	    (void)chmod(ctx->fname, 0666&~mask);
 	    free(ctx->tmpname);
 	    ctx->tmpname = NULL;
             return 0;