[src] Removed an unnecessary dereference check which confused Coverity Scan; replaced it with a PARROT_ASSERT.  See CID #53.  Also tidied some code.
[src] Removed an unnecessary dereference check which confused Coverity Scan;
replaced it with a PARROT_ASSERT.  See CID #53.  Also tidied some code.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@33259 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot