filesrc/sink: turn the bus messages into g_warning

Its a programming error.
diff --git a/plugins/elements/gstfilesink.c b/plugins/elements/gstfilesink.c
index 61216df..3d9b50a 100644
--- a/plugins/elements/gstfilesink.c
+++ b/plugins/elements/gstfilesink.c
@@ -251,10 +251,8 @@
   /* ERRORS */
 was_open:
   {
-    GST_ELEMENT_WARNING (sink, RESOURCE, BUSY,
-        ("Changing the `location' property on filesink when a file is open is "
-            "not supported."),
-        ("setting the 'location' property in wrong state"));
+    g_warning ("Changing the `location' property on filesink when a file is "
+        "open is not supported.");
     return FALSE;
   }
 }
diff --git a/plugins/elements/gstfilesrc.c b/plugins/elements/gstfilesrc.c
index e8b3261..f159089 100644
--- a/plugins/elements/gstfilesrc.c
+++ b/plugins/elements/gstfilesrc.c
@@ -373,10 +373,8 @@
   /* ERROR */
 wrong_state:
   {
-    GST_ELEMENT_WARNING (src, RESOURCE, BUSY,
-        ("Changing the `location' property on filesrc when a file is open is "
-            "not supported."),
-        ("setting the 'location' property in wrong state"));
+    g_warning ("Changing the `location' property on filesink when a file is "
+        "open is not supported.");
     GST_OBJECT_UNLOCK (src);
     return FALSE;
   }