Bug#45288: pb2 returns a lot of compilation warnings on linux

Fix assorted compiler warnings.

sql/mysqld.cc:
  Do not declare max_page_size twice. If large pages support
  is enabled, the code expects the size in max_desired_page_size.
storage/innobase/include/ibuf0ibuf.h:
  Remove trailing comma. Only present in C99.
  
  Approved by: Vasil (via IRC)
storage/innobase/include/row0row.h:
  Remove trailing comma. Only present in C99.
  
  Approved by: Vasil (via IRC)
strings/my_vsnprintf.c:
  No need to assert the obvious.

sql/mysqld.cc

@@ -3244,12 +3244,11 @@ static int init_common_variables()
     desired page sizes.
   */
    int nelem;
-   int max_desired_page_size;
-   int max_page_size;
+   size_t max_desired_page_size;
    if (opt_super_large_pages)
-     max_page_size= SUPER_LARGE_PAGESIZE;
+     max_desired_page_size= SUPER_LARGE_PAGESIZE;
    else
-     max_page_size= LARGE_PAGESIZE;
+     max_desired_page_size= LARGE_PAGESIZE;
    nelem = getpagesizes(NULL, 0);
    if (nelem > 0)
    {

storage/innobase/include/ibuf0ibuf.h

@@ -43,7 +43,7 @@ typedef enum {
 	IBUF_OP_DELETE = 2,
 
 	/* Number of different operation types. */
-	IBUF_OP_COUNT = 3,
+	IBUF_OP_COUNT = 3
 } ibuf_op_t;
 
 /** Combinations of operations that can be buffered.  Because the enum

storage/innobase/include/row0row.h

@@ -267,7 +267,7 @@ enum row_search_result {
 				secondary index leaf page was not in
 				the buffer pool, and the operation was
 				enqueued in the insert/delete buffer */
-	ROW_NOT_DELETED_REF,	/*!< BTR_DELETE was specified, and
+	ROW_NOT_DELETED_REF	/*!< BTR_DELETE was specified, and
 				row_purge_poss_sec() failed */
 };
 

strings/my_vsnprintf.c

@@ -513,7 +513,7 @@ static char *process_args(CHARSET_INFO *cs, char *to, char *end,
     arg_count= max(arg_count, arg_index);
     goto start;
   }
-  DBUG_ASSERT(0);
+
   return 0;
 }