writefrudata: delete unused variable

[writefrudata.cpp:580]: (style) Unused variable: defined_fru_area

Change-Id: Ic39b668db44e0111c078c214ed5d1ca11cb7b4bb
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/writefrudata.cpp b/writefrudata.cpp
index 1b8acba..a6c097e 100644
--- a/writefrudata.cpp
+++ b/writefrudata.cpp
@@ -577,7 +577,6 @@
     // Vector that holds individual IPMI FRU AREAs. Although MULTI and INTERNAL
     // are not used, keeping it here for completeness.
     fru_area_vec_t fru_area_vec;
-    std::vector<std::string> defined_fru_area;
 
     for(uint8_t fru_entry = IPMI_FRU_INTERNAL_OFFSET;
         fru_entry < (sizeof(struct common_header) -2); fru_entry++)