getpt.3: tfix

Signed-off-by: Jakub Wilk <jwilk@jwilk.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
diff --git a/man3/getpt.3 b/man3/getpt.3
index 802f73e..ba46ea9 100644
--- a/man3/getpt.3
+++ b/man3/getpt.3
@@ -21,7 +21,7 @@
 .PP
 .in +4n
 .EX
-open(/dev/ptmx, O_RDWR | O_NOCTTY);
+open("/dev/ptmx", O_RDWR | O_NOCTTY);
 .EE
 .in
 .PP