mISDN: use NULL pointer instead of plain integer

Fix more than 100 (all remaining in mISDN) sparse warnings:

  drivers/isdn/hardware/mISDN/hfcmulti.c:***:**: warning: Using plain integer as NULL pointer
  drivers/isdn/mISDN/dsp_tones.c:***:**: warning: Using plain integer as NULL pointer
  drivers/isdn/mISDN/dsp_pipeline.c:***:**: warning: Using plain integer as NULL pointer

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Acked-by: Karsten Keil <kkeil@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/isdn/mISDN/dsp_pipeline.c b/drivers/isdn/mISDN/dsp_pipeline.c
index 850260ab57d0..5ee6651b45b9 100644
--- a/drivers/isdn/mISDN/dsp_pipeline.c
+++ b/drivers/isdn/mISDN/dsp_pipeline.c
@@ -249,7 +249,7 @@ int dsp_pipeline_build(struct dsp_pipeline *pipeline, const char *cfg)
                 name = strsep(&tok, "(");
                 args = strsep(&tok, ")");
                 if (args && !*args)
-                        args = 0;
+                        args = NULL;
 
                 list_for_each_entry_safe(entry, n, &dsp_elements, list)
                         if (!strcmp(entry->elem->name, name)) {