Log Message:
-----------
Fix some minor infelicities in ecpg's pgtypeslib: (1) `pstr' must be
non-NULL in this function, so there is no need to check for it (2) we
should check the return value of pgtypes_strdup(). Patch from Eric
Astor at EnterpriseDB, with slight cleanup by myself, per a report
from the Coverity tool.

Modified Files:
--------------
pgsql/src/interfaces/ecpg/pgtypeslib:
dt_common.c (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsw...1=1.23&r2=1.24)

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