mISDN: Fixed more indexing bugs

Fix more indexing bugs  when checking free timeslots.

Signed-off-by: Andreas Eversberg <andreas@eversberg.eu>
Signed-off-by: Karsten Keil <kkeil@suse.de>
diff --git a/drivers/isdn/mISDN/dsp_cmx.c b/drivers/isdn/mISDN/dsp_cmx.c
index b16f76c..04dbb40 100644
--- a/drivers/isdn/mISDN/dsp_cmx.c
+++ b/drivers/isdn/mISDN/dsp_cmx.c
@@ -744,11 +744,11 @@
 					if (dsp->pcm_slot_rx >= 0 &&
 					    dsp->pcm_slot_rx <
 					    sizeof(freeslots))
-						freeslots[dsp->pcm_slot_tx] = 0;
+						freeslots[dsp->pcm_slot_rx] = 0;
 					if (dsp->pcm_slot_tx >= 0 &&
 					    dsp->pcm_slot_tx <
 					    sizeof(freeslots))
-						freeslots[dsp->pcm_slot_rx] = 0;
+						freeslots[dsp->pcm_slot_tx] = 0;
 				}
 			}
 			i = 0;
@@ -836,11 +836,11 @@
 					if (dsp->pcm_slot_rx >= 0 &&
 					    dsp->pcm_slot_rx <
 					    sizeof(freeslots))
-						freeslots[dsp->pcm_slot_tx] = 0;
+						freeslots[dsp->pcm_slot_rx] = 0;
 					if (dsp->pcm_slot_tx >= 0 &&
 					    dsp->pcm_slot_tx <
 					    sizeof(freeslots))
-						freeslots[dsp->pcm_slot_rx] = 0;
+						freeslots[dsp->pcm_slot_tx] = 0;
 				}
 			}
 			i1 = 0;