[BOX64] error on test siglongjump

[luoqiaoling]

Hi ptitSeb,
I found an issue in the my_longjmp​ function in the file src/wrapped/wrappedlibc.cin box64.
The correct fix is as follows:

Change：

R_RAX = __val;

to：

if (__val == 0) {
R_RAX = 1;
} else {
R_RAX = __val;
}

test case for verification：

#include <stdio.h>
#include <setjmp.h>

sigjmp_buf env;

int main() {
int r = sigsetjmp(env, 1);
if (r == 0) {
printf("first\n");
siglongjmp(env, 0);
} else {
printf("second %d\n", r);
}
return 0;
}

[ptitSeb]

Ah indeed, I'll fix that thanks.