fix get_cdata (#917)

Author: larshp

src/http/cl_http_entity.clas.abap

@@ -5,7 +5,7 @@ CLASS cl_http_entity DEFINITION PUBLIC CREATE PRIVATE.
 
     ALIASES set_header_field FOR if_http_entity~set_header_field.
     ALIASES append_cdata FOR if_http_entity~append_cdata.
-    ALIASES get_cdata FOR if_http_entity~append_cdata.
+    ALIASES get_cdata FOR if_http_entity~get_cdata.
   PROTECTED SECTION.
     DATA m_last_error TYPE i.
   PRIVATE SECTION.