Revert part of the r235740 which changed separate allocation of the string buffer for each linelist l_line into one large string. Since linelists parsed out during the previous passes store the pointers to previously allocated l_lines, the reallocation caused undefined behaviour on accessing the buffers, and quite deterministic fault on freeing them (in mountd(8) startup).
Revert part of the r235740 which changed separate allocation of the
string buffer for each linelist l_line into one large string. Since
linelists parsed out during the previous passes store the pointers to
previously allocated l_lines, the reallocation caused undefined
behaviour on accessing the buffers, and quite deterministic fault on
freeing them (in mountd(8) startup).

This fixes reading of netgroup(5) file which contains more then one
netgroup.

Discussed with:	ghelmer
MFC after:	3 days

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