Cleanup: Remove redundant nonnull attributes

storage/innobase/include/os0file.h

@@ -237,8 +237,7 @@ class IORequest
   @param off   byte offset from the start (SEEK_SET)
   @param len   size of the hole in bytes
   @return DB_SUCCESS or error code */
-  dberr_t punch_hole(os_offset_t off, ulint len) const
-    MY_ATTRIBUTE((nonnull));
+  dberr_t punch_hole(os_offset_t off, ulint len) const;
 
 public:
   /** Page to be written on write operation */

storage/innobase/include/trx0undo.h

@@ -160,8 +160,7 @@ trx_undo_get_first_rec(const fil_space_t &space, uint32_t page_no,
 NOTE: This corresponds to a redo log record and must not be changed!
 @see mtr_t::undo_create()
 @param[in,out]	block	undo log page */
-void trx_undo_page_init(const buf_block_t &block)
-	MY_ATTRIBUTE((nonnull));
+void trx_undo_page_init(const buf_block_t &block);
 
 /** Allocate an undo log page.
 @param[in,out]	undo	undo log

storage/innobase/srv/srv0start.cc

@@ -341,7 +341,7 @@ static dberr_t create_log_file(bool create_new_db, lsn_t lsn,
 @param[in,out]	logfile0	name of the first log file
 @return	error code
 @retval	DB_SUCCESS	on successful operation */
-MY_ATTRIBUTE((warn_unused_result, nonnull))
+MY_ATTRIBUTE((warn_unused_result))
 static dberr_t create_log_file_rename(lsn_t lsn, std::string &logfile0)
 {
   ut_ad(!srv_log_file_created);