Cleanup: Remove unused DYN_BLOCK_FULL_FLAG

This had become unused in commit 2e814d47
or mysql/mysql-server@eca5b0fc17a5bd6d4833d35a0d08c8549dd3b5ec.
This cleanup affects mtr_buf_t::used().

storage/innobase/include/dyn0buf.h

@@ -60,7 +60,7 @@ class mtr_buf_t {
 		ulint used() const
 			MY_ATTRIBUTE((warn_unused_result))
 		{
-			return(static_cast<ulint>(m_used & ~DYN_BLOCK_FULL_FLAG));
+			return m_used;
 		}
 
 		/**
@@ -153,8 +153,7 @@ class mtr_buf_t {
 		/** Storage */
 		byte		m_data[MAX_DATA_SIZE];
 
-		/** number of data bytes used in this block;
-		DYN_BLOCK_FULL_FLAG is set when the block becomes full */
+		/** number of data bytes used in this block */
 		uint32_t	m_used;
 
 		friend class mtr_buf_t;

storage/innobase/include/dyn0types.h

@@ -33,7 +33,4 @@ Created 2013-03-16 Sunny Bains
 this must be > MLOG_BUF_MARGIN + 30! */
 #define	DYN_ARRAY_DATA_SIZE	512
 
-/** Flag for dyn_block_t::used that indicates a full block */
-#define DYN_BLOCK_FULL_FLAG	0x1000000UL
-
 #endif /* dyn0types_h */