staging/rts_pstor: Delete some lines (dev_info() and dev_err()) in rtsx.c

fixed some coccinelle warnings.
+ drivers/staging/rts_pstor/rtsx.c:397:16-19: ERROR: dev is NULL but dereferenced.
  drivers/staging/rts_pstor/rtsx.c:447:16-19: ERROR: dev is NULL but dereferenced.
  drivers/staging/rts_pstor/rtsx.c:358:16-19: ERROR: dev is NULL but dereferenced.

Signed-off-by: YAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>