Meta+Kernel: Make clang-format-10 clean

Author: https://github.com/BenWiederhake
Commit: 64cc3f51d0
Pull-request: https://github.com/SerenityOS/serenity/pull/3541
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/linusg

Kernel/FileSystem/FileSystem.h

@@ -78,7 +78,7 @@ public:
         u8 file_type { 0 };
     };
 
-    virtual void flush_writes() {}
+    virtual void flush_writes() { }
 
     size_t block_size() const { return m_block_size; }