Free config file buffer in case of error

Test: Nfc enable/disable
Fixes: 69636569
Change-Id: I484d045e1453488cc75ccd966f0c76b8459fc37d
diff --git a/halimpl/pn54x/utils/phNxpConfig.cpp b/halimpl/pn54x/utils/phNxpConfig.cpp
index 9e8c7cb..05a26c4 100644
--- a/halimpl/pn54x/utils/phNxpConfig.cpp
+++ b/halimpl/pn54x/utils/phNxpConfig.cpp
@@ -87,6 +87,7 @@
     return file_size;
   }
 
+  delete[] buffer;
   return 0;
 }