ALSA: hdspm - Fix compile warnings with PPC

The char can be unsigned on some architectures.  Since the code checks
the negative values, they should be declared as signed char explicitly.

  sound/pci/rme9652/hdspm.c:5449: warning: comparison is always false due to limited range of data type
  sound/pci/rme9652/hdspm.c:5462: warning: comparison is always false due to limited range of data type

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 4 insertions, 4 deletions

diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 3f08afc0f0d3..c8e402fc3782 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -896,11 +896,11 @@ struct hdspm {
         unsigned char max_channels_in;
         unsigned char max_channels_out;
 
-        char *channel_map_in;
-        char *channel_map_out;
+        signed char *channel_map_in;
+        signed char *channel_map_out;
 
-        char *channel_map_in_ss, *channel_map_in_ds, *channel_map_in_qs;
-        char *channel_map_out_ss, *channel_map_out_ds, *channel_map_out_qs;
+        signed char *channel_map_in_ss, *channel_map_in_ds, *channel_map_in_qs;
+        signed char *channel_map_out_ss, *channel_map_out_ds, *channel_map_out_qs;
 
         char **port_names_in;
         char **port_names_out;