[PATCH] Manage.c: fix make everything compilation error

[Lukasz Dorau <lukasz.dorau@xxxxxxxxx>]

This patch fixes the following make everything compilation error:
Manage.c: In function ‘Manage_add’:
Manage.c:538: error: ‘dev_st’ may be used uninitialized in this function
make: *** [mdadm.Os] Error 1

Signed-off-by: Lukasz Dorau <lukasz.dorau@xxxxxxxxx>
---
 Manage.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/Manage.c b/Manage.c
index d5fc974..f83af65 100644
--- a/Manage.c
+++ b/Manage.c
@@ -535,7 +535,7 @@ int Manage_add(int fd, int tfd, struct mddev_dev *dv,
 	       char *update, unsigned long rdev, unsigned long long array_size)
 {
 	unsigned long long ldsize;
-	struct supertype *dev_st;
+	struct supertype *dev_st = NULL;
 	int j;
 	mdu_disk_info_t disc;
 

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