Compile error in gst-plugins-base master

[Aaron Boxer]

gstalsasrc.c: In function ‘gst_alsasrc_change_state’:
gstalsasrc.c:240:10: error: ‘GST_STATE_CHANGE_NULL_TO_NULL’ undeclared
(first use in this function)
     case GST_STATE_CHANGE_NULL_TO_NULL:
          ^


Error is present after  make clean  and make
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