Remove sysfd

sysfd isn't used anymore in svg_title() and has never been since moving
into main() as a local variable. Let's remove it.

Follow-up-for: f91781329c6d8a760e3c1b88b66b0e2137c2e5ab@systemd

src/bootchart.c

@@ -315,7 +315,6 @@ int main(int argc, char *argv[]) {
         _cleanup_closedir_ DIR *proc = NULL;
         _cleanup_free_ char *build = NULL;
         _cleanup_fclose_ FILE *of = NULL;
-        _cleanup_close_ int sysfd = -1;
         int schfd;
         struct ps_struct *ps_first;
         double graph_start;
@@ -415,9 +414,6 @@ int main(int argc, char *argv[]) {
                 sampledata->sampletime = gettime_ns();
                 sampledata->counter = samples;
 
-                if (sysfd < 0)
-                        sysfd = open("/sys", O_RDONLY|O_CLOEXEC);
-
                 if (!build) {
                         if (parse_env_file("/etc/os-release", NEWLINE, "PRETTY_NAME", &build, NULL) == -ENOENT)
                                 parse_env_file("/usr/lib/os-release", NEWLINE, "PRETTY_NAME", &build, NULL);