objtool: Fix calloc call for new -Walloc-size

GCC 14 introduces a new -Walloc-size included in -Wextra which errors out
like:
```
check.c: In function ‘cfi_alloc’:
check.c:294:33: error: allocation of insufficient size ‘1’ for type ‘struct cfi_state’ with size ‘320’ [-Werror=alloc-size]
294 | struct cfi_state *cfi = calloc(sizeof(struct cfi_state), 1);
| ^~~~~~
```

The calloc prototype is:
```
void *calloc(size_t nmemb, size_t size);
```

So, just swap the number of members and size arguments to match the prototype, as
we're initialising 1 struct of size `sizeof(struct ...)`. GCC then sees we're not
doing anything wrong.

Signed-off-by: Sam James <[e-mail]>
Signed-off-by: Peter Zijlstra (Intel) <[e-mail]>
Acked-by: Josh Poimboeuf <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

tools/objtool/check.c

···
 
 static struct cfi_state *cfi_alloc(void)
 {
-	struct cfi_state *cfi = calloc(sizeof(struct cfi_state), 1);
+	struct cfi_state *cfi = calloc(1, sizeof(struct cfi_state));
 	if (!cfi) {
 		WARN("calloc failed");
 		exit(1);