[Rpm-maint] [rpm-software-management/rpm] Auto-print returned values from Lua macros (PR #1837)

[Michael Schroeder]

@mlschroe commented on this pull request.



>  	rpmlog(RPMLOG_ERR, _("lua script failed: %s\n"),
 		 lua_tostring(L, -1));
 	lua_pop(L, 1);
 	goto exit;
     }
+
+    int nret = lua_gettop(L) - otop;
+    if (nret > 0 && lua->printbuf)
+	rpm_print(L);

My suggestion was something like (untested):
```
lua_getglobal(L, "print");
lua_insert(L, otop);
if (lua_pcall(L, nret, 0, 0) != 0) {
        rpmlog(RPMLOG_ERR, result print failed: %s\n"),
                 lua_tostring(L, -1));
        lua_pop(L, 1);
}
```

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