Fix code analyzer warnings

internal/cache/cache.go

@@ -67,11 +67,10 @@ func (c *Cache) LockCache() {
 	c.checkLock()
 
 	file, err := os.OpenFile(c.file+".lock", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o640)
-	defer file.Close()
-
 	if err != nil {
 		c.log.Fatal("Failed to lock cache", c.log.Args("error", err))
 	}
+	file.Close()
 }
 
 func (c *Cache) checkLock() {