Rework all non-contributed files that use `struct timezone'.

This structure is not part of POSIX. According to POSIX, gettimeofday()
has the following prototype:

	int gettimeofday(struct timeval *restrict tp, void *restrict tzp);

Also, POSIX states that gettimeofday() shall return 0 (as long as tzp is
not used). Remove dead error handling code. Also use NULL for a
nul-pointer instead of integer 0.

While there, change all pieces of code that only use tv_sec to use
time(3), as this provides less overhead.

2 files changed, 3 insertions, 3 deletions

diff --git a/bin/dd/dd.c b/bin/dd/dd.c
index 0bb43f7..637e0cc 100644
--- a/bin/dd/dd.c
+++ b/bin/dd/dd.c
@@ -232,8 +232,8 @@ setup(void)
 		ctab = casetab;
 	}
 
-	(void)gettimeofday(&tv, (struct timezone *)NULL);
-	st.start = tv.tv_sec + tv.tv_usec * 1e-6; 
+	(void)gettimeofday(&tv, NULL);
+	st.start = tv.tv_sec + tv.tv_usec * 1e-6;
 }
 
 static void
diff --git a/bin/dd/misc.c b/bin/dd/misc.c
index 4f538bc..8edc5a5 100644
--- a/bin/dd/misc.c
+++ b/bin/dd/misc.c
@@ -59,7 +59,7 @@ summary(void)
 	double secs;
 	char buf[100];
 
-	(void)gettimeofday(&tv, (struct timezone *)NULL);
+	(void)gettimeofday(&tv, NULL);
 	secs = tv.tv_sec + tv.tv_usec * 1e-6 - st.start;
 	if (secs < 1e-6)
 		secs = 1e-6;