ccanlint: check unused result.

GCC with -O gives an error here.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/tools/ccanlint/tests/examples_exist.c b/tools/ccanlint/tests/examples_exist.c
index 19d61a89e3a058135495c607dc2b733b1c15ecba..61359596e1f693ed56a127c613724462e1f1f2d7 100644 (file)
--- a/tools/ccanlint/tests/examples_exist.c
+++ b/tools/ccanlint/tests/examples_exist.c
@@ -45,7 +45,10 @@ static char *add_example(struct manifest *m, struct ccan_file *source,
        /* Add #line to demark where we are from, so errors are correct! */
        linemarker = tal_fmt(f, "#line %i \"%s\"\n",
                             example->srcline+2, source->fullname);
-       write(fd, linemarker, strlen(linemarker));
+       if (write(fd, linemarker, strlen(linemarker)) != (int)strlen(linemarker)) {
+               close(fd);
+               return cast_const(char *, "Failure writing to temporary file");
+       }
 
        for (i = 0; i < example->num_lines; i++) {
                if (write(fd, example->lines[i], strlen(example->lines[i]))