Make sure the empty tree exists when needed in merge-recursive.

diff --git a/test-delta.c b/test-delta.c
index e5d31ca2e7f913e461e818cb1a80ff4037296b9e..1be8ee0c721ec35372fee4e686d9664b143b4345 100644 (file)
--- a/test-delta.c
+++ b/test-delta.c
@@ -17,7 +17,7 @@
 #include <sys/mman.h>
 #include "delta.h"
 
-static const char *usage =
+static const char usage[] =
        "test-delta (-d|-p) <from_file> <data_file> <out_file>";
 
 int main(int argc, char *argv[])