plpsm - plpgpsm: fix wrong initialisation of compose types.

Log Message:
-----------
fix wrong initialisation of compose types.

Modified Files:
--------------
plpgpsm/src:
gram.y (r1.58 -> r1.59)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/gram.y.diff?r1=1.58&r2=1.59)
pl_comp.c (r1.25 -> r1.26)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_comp.c.diff?r1=1.25&r2=1.26)
pl_exec.c (r1.61 -> r1.62)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/pl_exec.c.diff?r1=1.61&r2=1.62)
plpgpsm.h (r1.47 -> r1.48)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plpsm/plpgpsm/src/plpgpsm.h.diff?r1=1.47&r2=1.48)