libbpf: Fix comment typo

Remove the repeated word 'the' in line 48.
Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210727115928.74600-1-wangborong@cdjrlc.com

tools/lib/bpf/libbpf.c

@@ -8260,7 +8260,7 @@ static int find_btf_by_prefix_kind(const struct btf *btf, const char *prefix,
 	ret = snprintf(btf_type_name, sizeof(btf_type_name),
 		       "%s%s", prefix, name);
 	/* snprintf returns the number of characters written excluding the
-	 * the terminating null. So, if >= BTF_MAX_NAME_SIZE are written, it
+	 * terminating null. So, if >= BTF_MAX_NAME_SIZE are written, it
 	 * indicates truncation.
 	 */
 	if (ret < 0 || ret >= sizeof(btf_type_name))