InnoDB bug fix: mem_realloc() didn't preserve the block contents

	char*  	file_name,/* in: file name where called */

	ulint 	line)  	/* in: line where called */

{

	mem_heap_t*	heap = (mem_heap_t*)((byte*)buf

			- MEM_BLOCK_HEADER_SIZE - MEM_FIELD_HEADER_SIZE);

	ulint		size;

	ut_a(heap->magic_n == MEM_BLOCK_MAGIC_N);

	size = mem_block_get_len(heap);

	ut_a(size > MEM_BLOCK_HEADER_SIZE + MEM_FIELD_HEADER_SIZE);

	size -= MEM_BLOCK_HEADER_SIZE + MEM_FIELD_HEADER_SIZE;

	if (n > size) {

		void*	newbuf = memcpy(mem_alloc_func(n, file_name, line),

					buf, size);

		mem_free(buf);

	return(mem_alloc_func(n, file_name, line));

		buf = newbuf;

	}

	return(buf);

}

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