delete allocated array properly (iovisor#2285)

In bcc_btf.cc, new_btf_sec is allocated with something like
   new_btf_sec = new uint8_t[tmp_sec_size]

Since the allocation is an array, the deletion should be
   delete[] new_btf_sec
instead of
   delete new_btf_sec

This patch fixed the problem.

Signed-off-by: Yonghong Song <[email protected]>

src/cc/bcc_btf.cc

@@ -179,7 +179,7 @@ int BTF::load(uint8_t *btf_sec, uintptr_t btf_sec_size,
 
  if (new_btf_sec) {
  btf = btf__new(new_btf_sec, new_btf_sec_size);
- delete new_btf_sec;
+ delete[] new_btf_sec;
  } else {
  btf = btf__new(btf_sec, btf_sec_size);
  }