lib/transaction_check_revdeps.c: fix regression in revdeps check

this is probably the same as reported in #245.

Its again not resetting/initializing a variable in a loop,
falling back to the previous set value.

lib/transaction_check_revdeps.c

@@ -172,6 +172,8 @@ xbps_transaction_check_revdeps(struct xbps_handle *xhp, xbps_array_t pkgs)
 				error = true;
 				goto out;
 			}
+
+			ttype = 0;
 			if ((revpkgd = xbps_find_pkg_in_array(pkgs, pkgname, 0))) {
 				ttype = xbps_transaction_pkg_type(revpkgd);
 				if (ttype == XBPS_TRANS_REMOVE)