tools: fix up warnings with -Wwrite-strings.

[ccan] / tools / ccanlint / tests / examples_exist.c

diff --git a/tools/ccanlint/tests/examples_exist.c b/tools/ccanlint/tests/examples_exist.c
index 2091f67f0f97c82218b57d77a380ee3528eedc4f..085f673a7e5ed506a6abe819911ef8e21af5a444 100644 (file)
--- a/tools/ccanlint/tests/examples_exist.c
+++ b/tools/ccanlint/tests/examples_exist.c
@@ -2,6 +2,7 @@
 #include <tools/tools.h>
 #include <ccan/talloc/talloc.h>
 #include <ccan/str/str.h>
+#include <ccan/cast/cast.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -48,7 +49,8 @@ static char *add_example(struct manifest *m, struct ccan_file *source,
                    != strlen(example->lines[i])
                    || write(fd, "\n", 1) != 1) {
                        close(fd);
-                       return "Failure writing to temporary file";
+                       return cast_const(char *,
+                                         "Failure writing to temporary file");
                }
        }
        close(fd);