Fix sparse warning: Using plain integer as NULL pointer

This patch fixes the "using plain integer as NULL pointer" warnings
generated by running sparse on the flashrom source.

Corresponding to flashrom svn r1255.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Acked-by: Mathias Krause <mathias.krause@secunet.com>
Acked-by: Stefan Reinauer <stepan@coreboot.org>
diff --git a/udelay.c b/udelay.c
index 153f510..feae827 100644
--- a/udelay.c
+++ b/udelay.c
@@ -45,11 +45,11 @@
 	struct timeval start, end;
 	unsigned long counter = 0;
 	
-	gettimeofday(&start, 0);
+	gettimeofday(&start, NULL);
 	timeusec = 0;
 	
 	while (!timeusec && (++counter < 1000000000)) {
-		gettimeofday(&end, 0);
+		gettimeofday(&end, NULL);
 		timeusec = 1000000 * (end.tv_sec - start.tv_sec) +
 			   (end.tv_usec - start.tv_usec);
 		/* Protect against time going forward too much. */
@@ -68,9 +68,9 @@
 	unsigned long timeusec;
 	struct timeval start, end;
 	
-	gettimeofday(&start, 0);
+	gettimeofday(&start, NULL);
 	myusec_delay(usecs);
-	gettimeofday(&end, 0);
+	gettimeofday(&end, NULL);
 	timeusec = 1000000 * (end.tv_sec - start.tv_sec) +
 		   (end.tv_usec - start.tv_usec);
 	/* Protect against time going forward too much. */