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ext4_bcache: manipulate buffer refctr by two helpers

  - ext4_bcache_inc_ref
  - ext4_bcache_dec_ref

--- a/lwext4/ext4_bcache.c

+++ b/lwext4/ext4_bcache.c

@@ -180,7 +180,7 @@

 		}

-		buf->refctr++;

+		ext4_bcache_inc_ref(buf);

 		b->buf = buf;

 		b->data = buf->data;

@@ -198,7 +198,7 @@

 	/* One more buffer in bcache now. :-) */

 	bc->ref_blocks++;

-	buf->refctr = 1;

+	ext4_bcache_inc_ref(buf);

 	/* Assign new value to LRU id and increment LRU counter

 	 * by 1*/

 	buf->lru_id = ++bc->lru_ctr;

@@ -226,7 +226,7 @@

 	ext4_assert(buf->refctr);

 	/*Just decrease reference counter*/

-	buf->refctr--;

+	ext4_bcache_dec_ref(buf);

 	/* We are the last one touching this buffer, do the cleanups. */

 	if (!buf->refctr) {

--- a/lwext4/ext4_bcache.h

+++ b/lwext4/ext4_bcache.h

@@ -166,6 +166,12 @@

 	ext4_bcache_clear_flag(buf, BC_DIRTY);

 }

+/**@brief   Increment reference counter of buf by 1.*/

+#define ext4_bcache_inc_ref(buf) ((buf)->refctr++)

+

+/**@brief   Decrement reference counter of buf by 1.*/

+#define ext4_bcache_dec_ref(buf) ((buf)->refctr--)

+

 /**@brief   Static initializer of block cache structure.*/

 #define EXT4_BCACHE_STATIC_INSTANCE(__name, __cnt, __itemsize)                 \

 	static struct ext4_bcache __name = {                                   \