NetBpfLoad: add a few more consts for safety

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I4f59ec295b34d6942732bb5f636699385e998bba
diff --git a/netbpfload/loader.cpp b/netbpfload/loader.cpp
index a125ffd..9dd0d2a 100644
--- a/netbpfload/loader.cpp
+++ b/netbpfload/loader.cpp
@@ -1087,7 +1087,7 @@
     return 0;
 }
 
-int loadProg(const char* elfPath, bool* isCritical, const unsigned int bpfloader_ver,
+int loadProg(const char* const elfPath, bool* const isCritical, const unsigned int bpfloader_ver,
              const Location& location) {
     vector<char> license;
     vector<char> critical;