Fix return code for --detail-platform

From: Maciej Naruszewicz <maciej.naruszewicz@intel.com>

Variable 'err' is initially set to 1, so changing its value with
'|=' won't set it to 0 even if the operation is successful.

Signed-off-by: Maciej Naruszewicz <maciej.naruszewicz@intel.com>
---
 Detail.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/Detail.c b/Detail.c
index 1d67bd2..1b3e17b 100644
--- a/Detail.c
+++ b/Detail.c
@@ -639,6 +639,7 @@ int Detail_Platform(struct superswitch *ss, int scan, int verbose, int export, c
 	if (!scan)
 		return err;
 
+	err = 0;
 	for (i = 0; superlist[i]; i++) {
 		struct superswitch *meta = superlist[i];