(ITS#4466) typo & missing error checks in slapi:pblock_get()

[h.b.furuseth@usit.uio.no]

Full_Name: Hallvard B Furuseth
Version: HEAD
OS: 
URL: 
Submission from: (NULL) (129.240.186.42)
Submitted by: hallvard


slapi_pblock.c:pblock_get(,SLAPI_MODIFY_MODS,)
has a 'defaulat:' which should be 'default:'.
Also it uses 'ml' uninitialized if the defaul(a)t: case is taken.