Handle opening errors in gzopen properly

diff --git a/yarrg/common.c b/yarrg/common.c
index f95e585866657f8d8e29c19c7c31b5daeae9c977..cc33235f2b11d2fab791a7376113ac56d05002d6 100644 (file)
--- a/yarrg/common.c
+++ b/yarrg/common.c
@@ -122,7 +122,7 @@ int gzopen(const char *zpath, int oflags, FILE **f_r, pid_t *pid_r,
           const char *gziplevel /* 0 for read; may be 0, or "-1" etc. */) {
 
   int zfd= open(zpath, oflags, 0666);
-  if (!zfd) return errno;
+  if (zfd<0) return errno;
 
   int pipefds[2];
   sysassert(! pipe(pipefds) );