f2fs: remove unnecessary blank lines

Just cleanup.
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -1382,8 +1382,6 @@ enum {
 	MEMORY_MODE_LOW,	/* memory mode for low memry devices */
 };
 
-
-
 static inline int f2fs_test_bit(unsigned int nr, char *addr);
 static inline void f2fs_set_bit(unsigned int nr, char *addr);
 static inline void f2fs_clear_bit(unsigned int nr, char *addr);