main: fix segfault when passed source file is empty

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/main.c b/main.c
index de429ab..9850b81 100644
--- a/main.c
+++ b/main.c
@@ -235,7 +235,7 @@ main(int argc, char **argv)
 		}
 	}
 
-	rv = parse(source, dumponly);
+	rv = source ? parse(source, dumponly) : 0;
 
 out:
 	if (input && input != stdin)