[PATCHv2] mdadm.c: fix compile error "switch condition has boolean value"

[Gioh Kim]

Remove a boolean expression in switch condition
to prevent compile error of some compilers,
for example, gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2).

Signed-off-by: Gioh Kim <gi-oh....@profitbricks.com>
---
 mdadm.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/mdadm.c b/mdadm.c
index 0f32773..d6b5437 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1965,14 +1965,12 @@ static int misc_list(struct mddev_dev *devlist,
                        rv |= SetAction(dv->devname, c->action);
                        continue;
                }
-               switch(dv->devname[0] == '/') {
-                       case 0:
-                               mdfd = open_dev(dv->devname);
-                               if (mdfd >= 0)
-                                       break;
-                       case 1:
-                               mdfd = open_mddev(dv->devname, 1);  
-               }
+
+               if (dv->devname[0] != '/')
+                       mdfd = open_dev(dv->devname);
+               if (dv->devname[0] == '/' || mdfd < 0)
+                       mdfd = open_mddev(dv->devname, 1);
+
                if (mdfd >= 0) {
                        switch(dv->disposition) {
                        case 'R':
-- 
2.5.0