properly close va_list

Str.c

@@ -105,6 +105,7 @@ Strnew_m_charp(const char *p, ...)
 	Strcat_charp(r, p);
 	p = va_arg(ap, char *);
     }
+    va_end(ap);
     return r;
 }
 
@@ -276,6 +277,7 @@ Strcat_m_charp(Str x, ...)
     va_start(ap, x);
     while ((p = va_arg(ap, char *)) != NULL)
 	 Strcat_charp_n(x, p, strlen(p));
+    va_end(ap);
 }
 
 void