ps: address a potential 'newline' quirk the libselinux

Sometimes with libselinux present but SELinux inactive
the context reported is "unconfined" which contains an
embedded newline. This then causes misalignment of any
subsequent data. So, ps will now protect against that.

Reference(s):
http://www.freelists.org/post/procps/enablelibselinux-switch,14

Signed-off-by: Jim Warner <james.warner@comcast.net>

ps/output.c

@@ -1339,6 +1339,7 @@ static int pr_context(char *restrict const outbuf, const proc_t *restrict const
     len = strlen(context);
     if(len > max_len) len = max_len;
     memcpy(outbuf, context, len);
+    if (outbuf[len-1] == '\n') --len;
     outbuf[len] = '\0';
     free(context);
   }else{