From 4cbfc0f66eb3a9f1443256e0d62f2a75f90526e5 Mon Sep 17 00:00:00 2001
From: Greg Sjaardema <gsjaardema@gmail.com>
Date: Wed, 31 Jan 2018 10:02:09 -0700
Subject: [PATCH] Fix compression level settings

* level is unsigned, so can never be < 0
* If level is 0, then don't enable deflate filter.
---
 ncgen/genbin.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ncgen/genbin.c b/ncgen/genbin.c
index e107a50ca..f24db1290 100644
--- a/ncgen/genbin.c
+++ b/ncgen/genbin.c
@@ -249,13 +249,13 @@ genbin_definespecialattributes(Symbol* var)
 		level = 9; /* default */
 	    else
 		level = special->_FilterParams[0];
-	    if(level < 0 || level > 9)
+	    if(level > 9)
 		derror("Illegal deflate level");		
 	    else {
 	        stat = nc_def_var_deflate(var->container->ncid,
 	                var->ncid,
 	                (special->_Shuffle == 1?1:0),
-	                (level >= 0?1:0),
+	                (level > 0?1:0),
 			level);
 	    }
 	} else {