MDEV-11626 innodb.innodb-change-buffer-recovery fails for xtradb

buf_page_get_gen(): Remove the error log messages about
page flushing and eviction when
innodb_change_buffering_debug=1 is in effect.

storage/innobase/buf/buf0buf.c

@@ -2560,14 +2560,8 @@ buf_page_get_gen(
 				}
 			}
 			buf_pool_mutex_exit(buf_pool);
-			fprintf(stderr,
-				"innodb_change_buffering_debug evict %u %u\n",
-				(unsigned) space, (unsigned) offset);
 			return(NULL);
 		} else if (buf_flush_page_try(buf_pool, block)) {
-			fprintf(stderr,
-				"innodb_change_buffering_debug flush %u %u\n",
-				(unsigned) space, (unsigned) offset);
 			guess = block;
 			goto loop;
 		}

storage/xtradb/buf/buf0buf.c

@@ -2852,9 +2852,6 @@ buf_page_get_gen(
 				}
 			}
 			//buf_pool_mutex_exit(buf_pool);
-			fprintf(stderr,
-				"innodb_change_buffering_debug evict %u %u\n",
-				(unsigned) space, (unsigned) offset);
 
 			return(NULL);
 		} else if (UNIV_UNLIKELY(buf_block_get_state(block)
@@ -2875,9 +2872,6 @@ buf_page_get_gen(
 			ut_ad(!mutex_own(&buf_pool->LRU_list_mutex));
 
 			if (buf_flush_page_try(buf_pool, block)) {
-				fprintf(stderr,
-					"innodb_change_buffering_debug flush %u %u\n",
-					(unsigned) space, (unsigned) offset);
 				guess = block;
 				goto loop;
 			}