[PATCH] 4 coverity patches for ECPG

Here's some patches to clear up some of the most obvious problems with
ECPG. This is just scratching the surface, but it's good to start
somewhere:

- coverity_163.diff

Strange assumption about var. The rest of the code in the function
assumes var will not be NULL, yet this one line does not.

- coverity_170.diff

Assumption that PQresultErrorField will never return NULL.

- coverity_244.diff

The code allows con to be NULL, yet if it is, this line will segfault.

- coverity_252_253.diff

Move the PGTYPESnumeric_free outside the loop to avoid the double free
possibility.

- ecpgtest.patch

A patch which add a "make check" to the ecpg/test directory. I don't
expect this to be committed to CVS, but it's provided as an example of
the tests the above patches pass.
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.