Fix segfault when X starts

This patch potentially fixes bug https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=884934

System log entries when this bug occurs:
    kernel: xauth[16729]: segfault at 1 ip 00007f51f517f5a5 sp 00007ffdec846568 error 4
                          in libc-2.31.so[7f51f5102000+144000]
    kernel: Code: bc d1 f3 0f 7f 27 f3 0f 7f 6f 10 f3 0f 7f 77 20 f3 0f 7f 7f 30 49 83 c0
                  0f 49 29 d0 48 8d 7c 17 31 e9 8f 0b 00 00 66 0f ef c0 <f3> 0f 6f 0e f3
                  0f 6f 56 10 66 0f 74 c1 66 0f d7 d0 49 83 f8 11 0f

This bug happens when function get_address_info() in gethost.c is called
with a display name without forward slash, for example 'myhost.mydomain:0'

1 files changed, 1 insertions, 1 deletions

diff --git a/parsedpy.c b/parsedpy.c
index 97988d3..8aea441 100644
--- a/parsedpy.c
+++ b/parsedpy.c
@@ -172,7 +172,7 @@ parse_displayname (const char *displayname,
 #ifdef HAVE_STRLCPY
         strlcpy(path, displayname, sizeof(path));
 #else
-        strncpy(path, displayname, sizeof(path));
+        strncpy(path, displayname, sizeof(path) - 1);
         path[sizeof(path) - 1] = '\0';
 #endif
         if (0 == stat(path, &sbuf)) {