Omit include of ptrace.h for empty usdt contexts
Fixes:
@@ -356,6 +356,9 @@ const char *bcc_usdt_genargs(void **usdt_array, int len) {
static std::string storage_;
std::ostringstream stream;
+ if (!len)
+ return "";
+
stream << USDT::USDT_PROGRAM_HEADER;
// Generate genargs codes for an array of USDT Contexts.
//
