WebRtcSpl AffineTransform: make input const

Bug: webrtc:10548
Change-Id: I4241dfe7ba282270422f8f8e90a8e5a439d3031c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/132787
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27613}
diff --git a/common_audio/signal_processing/ilbc_specific_functions.c b/common_audio/signal_processing/ilbc_specific_functions.c
index b75b705..cbdd3dc 100644
--- a/common_audio/signal_processing/ilbc_specific_functions.c
+++ b/common_audio/signal_processing/ilbc_specific_functions.c
@@ -64,7 +64,7 @@
     }
 }
 
-void WebRtcSpl_AddAffineVectorToVector(int16_t *out, int16_t *in,
+void WebRtcSpl_AddAffineVectorToVector(int16_t *out, const int16_t *in,
                                        int16_t gain, int32_t add_constant,
                                        int16_t right_shifts,
                                        size_t vector_length)
@@ -77,7 +77,7 @@
     }
 }
 
-void WebRtcSpl_AffineTransformVector(int16_t *out, int16_t *in,
+void WebRtcSpl_AffineTransformVector(int16_t *out, const int16_t *in,
                                      int16_t gain, int32_t add_constant,
                                      int16_t right_shifts, size_t vector_length)
 {