libctf: fix uninitialized variables in testsuite

Just because a path is an error path doesn't mean the program terminates
there if you don't ask it to.  And we don't want to -- but that means
we need to initialize the variables that are missed if an error happens to
*something*.  Type ID 0 (unimplemented) will do: it'll induce further
ECTF_BADID errors, but that's no bad thing.

libctf/ChangeLog:

	* testsuite/libctf-writable/libctf-errors.c: Initialize variables.

libctf/testsuite/libctf-writable/libctf-errors.c

@@ -12,7 +12,7 @@ main (int argc, char *argv[])
   ctf_dict_t *fp;
   ctf_next_t *i = NULL;
   size_t boom = 0;
-  ctf_id_t itype, stype;
+  ctf_id_t itype = 0, stype = 0;
   ctf_encoding_t encoding = {0};
   ctf_membinfo_t mi;
   ssize_t ret;