failtest, rbuf: fix up incorrect lseek arg order.

SEEK_SET == 0, so it's not hurting anyone now, but when I cut & paste
it elsewhere...
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

ccan/failtest/test/run-open.c

@@ -29,7 +29,7 @@ int main(void)
 	}
 	/* Check it is read-write. */
 	ok1(write(fd, buf, strlen(buf)) == strlen(buf));
-	lseek(fd, SEEK_SET, 0);
+	lseek(fd, 0, SEEK_SET);
 	ok1(read(fd, buf, strlen("Hello world!")) == strlen("Hello world!"));
 	ok1(strcmp(buf, "Hello world!") == 0);
 

ccan/rbuf/test/run-partial-read.c

@@ -31,7 +31,7 @@ int main(void)
 
 	/* Grab ourselves for comparison. */
 	buf[full_read(fd, buf, sizeof(buf))] = '\0';
-	lseek(fd, SEEK_SET, 0);
+	lseek(fd, 0, SEEK_SET);
 
 	for (i = 0, p = buf; *p; i++) {
 		lines[i] = p;

ccan/rbuf/test/run-term-eof.c

@@ -27,7 +27,7 @@ int main(void)
 	/* Grab ourselves for comparison. */
 	len = read(fd, buf, sizeof(buf));
 	buf[len] = '\0';
-	lseek(fd, SEEK_SET, 0);
+	lseek(fd, 0, SEEK_SET);
 
 	/* We have exact-size buffer, which causes problems adding term. */
 	rbuf_init(&in, fd, malloc(len), len, test_realloc);
@@ -44,7 +44,7 @@ int main(void)
 	free(rbuf_cleanup(&in));
 
 	/* Try again. */
-	lseek(fd, SEEK_SET, 0);
+	lseek(fd, 0, SEEK_SET);
 	rbuf_init(&in, fd, malloc(len), len, test_realloc);
 	p = rbuf_read_str(&in, 64);
 	ok1(p);
@@ -53,7 +53,7 @@ int main(void)
 	free(rbuf_cleanup(&in));
 
 	/* Normal case, we get rbuf_start after nul */
-	lseek(fd, SEEK_SET, 0);
+	lseek(fd, 0, SEEK_SET);
 	rbuf_init(&in, fd, NULL, 0, test_realloc);
 	p = rbuf_read_str(&in, '^');
 	ok1(p);

ccan/rbuf/test/run.c

@@ -28,7 +28,7 @@ int main(void)
 	/* Grab ourselves for comparison. */
 	len = read(fd, buf, sizeof(buf));
 	buf[len] = '\0';
-	lseek(fd, SEEK_SET, 0);
+	lseek(fd, 0, SEEK_SET);
 
 	for (i = 0, p = buf; *p; i++) {
 		lines[i] = p;
@@ -62,7 +62,7 @@ int main(void)
 	free(rbuf_cleanup(&in));
 
 	/* Another way of reading the entire (text) file. */
-	lseek(fd, SEEK_SET, 0);
+	lseek(fd, 0, SEEK_SET);
 	rbuf_init(&in, fd, NULL, 0, test_realloc);
 	p = rbuf_read_str(&in, 0);
 	ok1(p);