storage_mysql.c sometimes increases buf an incorrect amount before writing to it

[smoku]

I found two calls to the MYSQL_SAFE macro in sm/storage_mysql.c that don’t increase a buffer enough before writing to it. This results in writing to some memory that shouldn’t be written to. There were also a few places where the buffer was being increased more than needed. See the attached patch for fixes (the first hunk and the last hunk are the important two!)

[smoku]

Patch by Mark Doliner <mark@…>

[smoku]

(In [136]) Integrated mysql_buffer_size_fixes by Mark Doliner. Closes #2.