* Read the contents of a file, specified by its path. The third argument
* can be used to give a hint about the file size, to avoid reallocs.
*/
-extern int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint);
+extern ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint);
/**
* Read the target of a symbolic link, specified by its path. The third