commit 9c5c4ff

drm: Use snprintf return value to calculate sysfs paths

 1@@ -46,17 +46,17 @@ static const struct drm_driver * find_driver(int fd)
 2     if (fstat(fd, &st) == -1)
 3         return NULL;
 4 
 5-    snprintf(path, sizeof path, "/sys/dev/char/%u:%u/",
 6-             major(st.st_rdev), minor(st.st_rdev));
 7-    path_part = path + strlen(path);
 8+    path_part = path + snprintf(path, sizeof path,
 9+                                "/sys/dev/char/%u:%u/device/",
10+                                major(st.st_rdev), minor(st.st_rdev));
11 
12-    strcpy(path_part, "device/vendor");
13+    strcpy(path_part, "vendor");
14     file = fopen(path, "r");
15     fgets(id, sizeof id, file);
16     fclose(file);
17     vendor_id = strtoul(id, NULL, 0);
18 
19-    strcpy(path_part, "device/device");
20+    strcpy(path_part, "device");
21     file = fopen(path, "r");
22     fgets(id, sizeof id, file);
23     fclose(file);