drivers/*: mark variables with uninitialized_var()

Mark variables in drivers/* with uninitialized_var() if such a warning
appears, and analysis proves that the var is initialized properly on all
paths it is used.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index 4dc10c8..7c6b223 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -368,7 +368,7 @@
 	int err, pnum, scrub = 0, idx = vol_id2idx(ubi, vol_id);
 	struct ubi_vid_hdr *vid_hdr;
 	struct ubi_volume *vol = ubi->volumes[idx];
-	uint32_t crc;
+	uint32_t uninitialized_var(crc);
 
 	err = leb_read_lock(ubi, vol_id, lnum);
 	if (err)