eo: Fix missing varags cleanup

Summary:
Coverity reports that va_end is never called for p_list when we error
out of this function. This patch adds a missing va_end before we error
out of here.

Fixes Coverity CID1399080

@fix
Depends on D8315

Reviewers: raster, cedric, q66, zmike, bu5hm4n, stefan

Reviewed By: q66

Subscribers: #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D8316

src/lib/eo/eo.c

@@ -1547,6 +1547,7 @@ efl_class_new(const Efl_Class_Description *desc, const Efl_Class *parent_id, ...
                        break;
                      default:
                        ERR("type cannot be INVALID");
+                       va_end(p_list);
                        return NULL;
                     }
                }