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gsm48_ie: gsm48_decode_freq_list(): make 'cd' argument const

Change-Id: Ide9110b984d3302aec6b439c563eb10e2dcdec9e
---
M include/osmocom/gsm/gsm48_ie.h
M src/gsm/gsm48_ie.c
2 files changed, 6 insertions(+), 4 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/08/30808/1

diff --git a/include/osmocom/gsm/gsm48_ie.h b/include/osmocom/gsm/gsm48_ie.h
index b79cbfc..4768283 100644
--- a/include/osmocom/gsm/gsm48_ie.h
+++ b/include/osmocom/gsm/gsm48_ie.h
@@ -117,8 +117,9 @@
 };
 
 /* decode "Cell Channel Description" (10.5.2.1b) and other frequency lists */
-int gsm48_decode_freq_list(struct gsm_sysinfo_freq *f, uint8_t *cd,
-			   uint8_t len, uint8_t mask, uint8_t frqt);
+int gsm48_decode_freq_list(struct gsm_sysinfo_freq *f,
+			   const uint8_t *cd, uint8_t len,
+			   uint8_t mask, uint8_t frqt);
 
 /* decode "CSN.1 encoded Classmark 3" (10.5.1.7) */
 int gsm48_decode_classmark3(struct gsm48_classmark3 *classmark3_out,
diff --git a/src/gsm/gsm48_ie.c b/src/gsm/gsm48_ie.c
index bbaec3d..5eca978 100644
--- a/src/gsm/gsm48_ie.c
+++ b/src/gsm/gsm48_ie.c
@@ -880,8 +880,9 @@
  *  \param[in] cd Cell Channel Description IE
  *  \param[in] len Length of \a cd in bytes
  *  \returns 0 on success; negative on error */
-int gsm48_decode_freq_list(struct gsm_sysinfo_freq *f, uint8_t *cd,
-			   uint8_t len, uint8_t mask, uint8_t frqt)
+int gsm48_decode_freq_list(struct gsm_sysinfo_freq *f,
+			   const uint8_t *cd, uint8_t len,
+			   uint8_t mask, uint8_t frqt)
 {
 	int i;
 

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