patch 8.0.0556: getting window position fails if GUI and term possible

Problem:    Getting the window position fails if both the GUI and term
            code is built in.
Solution:   Return after getting the GUI window position. (Kazunobu Kuriyama)
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 08f0a41..45c43f6 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -5302,6 +5302,7 @@
 
 	if (gui_mch_get_winpos(&x, &y) == OK)
 	    rettv->vval.v_number = x;
+	return;
     }
 #endif
 #if defined(HAVE_TGETENT) && defined(FEAT_TERMRESPONSE)
@@ -5328,6 +5329,7 @@
 
 	if (gui_mch_get_winpos(&x, &y) == OK)
 	    rettv->vval.v_number = y;
+	return;
     }
 #endif
 #if defined(HAVE_TGETENT) && defined(FEAT_TERMRESPONSE)
@@ -7715,6 +7717,7 @@
 /*
  * Create the directory in which "dir" is located, and higher levels when
  * needed.
+ * Return OK or FAIL.
  */
     static int
 mkdir_recurse(char_u *dir, int prot)
diff --git a/src/version.c b/src/version.c
index 7cf7644..efb2ef3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    556,
+/**/
     555,
 /**/
     554,