Fix crash when reading the empty tree

diff --git a/mktag.c b/mktag.c
index fc6a9bf5f34158605add585439848367deaefac5..23288781cf6caad62253130f75112e18eb4905aa 100644 (file)
--- a/mktag.c
+++ b/mktag.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "tag.h"
 
 /*
  * A signature file has a very simple fixed format: three lines
@@ -126,7 +127,7 @@ int main(int argc, char **argv)
        if (verify_tag(buffer, size) < 0)
                die("invalid tag signature file");
 
-       if (write_sha1_file(buffer, size, "tag", result_sha1) < 0)
+       if (write_sha1_file(buffer, size, tag_type, result_sha1) < 0)
                die("unable to write tag file");
        printf("%s\n", sha1_to_hex(result_sha1));
        return 0;