fix off-by-one error in checks for implementation-internal signal numbers

[oweals/musl.git] / src / misc / openpty.c

diff --git a/src/misc/openpty.c b/src/misc/openpty.c
index 0b4eb221497601fd4fcc56a9f0905f12a638f95d..102024732d09296596eb9b857ed316fb3ffc0685 100644 (file)
--- a/src/misc/openpty.c
+++ b/src/misc/openpty.c
@@ -12,7 +12,7 @@ int openpty(int *m, int *s, char *name, const struct termios *tio, const struct
        char buf[20];
 
        *m = open("/dev/ptmx", O_RDWR|O_NOCTTY);
-       if (!*m) return -1;
+       if (*m < 0) return -1;
 
        if (ioctl(*m, TIOCSPTLCK, &n) || ioctl (*m, TIOCGPTN, &n)) {
                close(*m);