Correct spelling of timestamp variable

The timestamp variable in the ipmi_add_sel_request_t struct
was misspelled.

Change-Id: I465432d021882f3966c44aec8cbdd779122521f6
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
diff --git a/storagehandler.hpp b/storagehandler.hpp
index cccd62e..bcc6c7d 100644
--- a/storagehandler.hpp
+++ b/storagehandler.hpp
@@ -27,7 +27,7 @@
 
     uint8_t recordid[2];
     uint8_t recordtype;
-    uint8_t timestampe[4];
+    uint8_t timestamp[4];
     uint8_t generatorid[2];
     uint8_t evmrev;
     uint8_t sensortype;