improve time(NULL) error checking

Use errx, time(NULL) does not set errno. For sfeed_curses reset errno so it
doesn't print a random error if it failed.

POSIX recommends checking against (time_t)-1 on failure.

Note that some implementation, like the OpenBSD man page says time() cannot
fail.

1 files changed, 2 insertions, 2 deletions

diff --git a/sfeed_gopher.c b/sfeed_gopher.c
index 9e8e10a..0b95b3d 100644
--- a/sfeed_gopher.c
+++ b/sfeed_gopher.c
@@ -137,8 +137,8 @@ main(int argc, char *argv[])
 			err(1, "pledge");
 	}
 
-	if ((comparetime = time(NULL)) == -1)
-		err(1, "time");
+	if ((comparetime = time(NULL)) == (time_t)-1)
+		errx(1, "time");
 	/* 1 day is old news */
 	comparetime -= 86400;