fix cl_git_mkfile() to test for -1 rather than 0 for errors from p_creat()
diff --git a/tests/clar_libgit2.c b/tests/clar_libgit2.c
index faeee03..9640b92 100644
--- a/tests/clar_libgit2.c
+++ b/tests/clar_libgit2.c
@@ -18,7 +18,7 @@ void cl_git_mkfile(const char *filename, const char *content)
int fd;
fd = p_creat(filename, 0666);
- cl_assert(fd != 0);
+ cl_assert(fd != -1);
if (content) {
cl_must_pass(p_write(fd, content, strlen(content)));