bpftool: Cast variable var to long long

When the SIGNED condition is met, the variable `var` should be cast to
`long long` instead of `unsigned long long`.

Signed-off-by: Luo Yifan <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Reviewed-by: Quentin Monnet <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

Author: Luo Yifan

tools/bpf/bpftool/btf.c

@@ -289,7 +289,7 @@ static int dump_btf_type(const struct btf *btf, __u32 id,
 			} else {
 				if (btf_kflag(t))
 					printf("\n\t'%s' val=%lldLL", name,
-					       (unsigned long long)val);
+					       (long long)val);
 				else
 					printf("\n\t'%s' val=%lluULL", name,
 					       (unsigned long long)val);