Fix entries used by phosphor-logging

Fixed entires used by phosphor::logging::log function. Now logs
display proper information.

Tested: - Verified if logs contain correct entries

Change-Id: I5254555aa55bbe06c882d7024db911812e6f3f63
Signed-off-by: Wludzik, Jozef <jozef.wludzik@intel.com>
diff --git a/src/report.cpp b/src/report.cpp
index dc8f37b..59028f4 100644
--- a/src/report.cpp
+++ b/src/report.cpp
@@ -190,7 +190,7 @@
     {
         phosphor::logging::log<phosphor::logging::level::ERR>(
             "Failed to store a report in storage",
-            phosphor::logging::entry("msg=", e.what()));
+            phosphor::logging::entry("EXCEPTION_MSG=%s", e.what()));
         return false;
     }