Work around coverity false positives in macros

We have some macros that may at times have signed arguments, and at
other times unsigned.  Checking for <= 0 is not a bug in this case.
Let's typecast any unsigned arguments to signed int to work around.

Change-Id: I10e60b20c6f8092cf1ce09ebe501e739fd4a9479
Closes: CID#272993, CID#272992 (and many others)
---
M include/osmocom/bsc/gsm_data.h
1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/include/osmocom/bsc/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index 44a9d5e..8c4dcce 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -495,9 +495,9 @@
  *
  * These macros convert from n to the other representations:
  */
-#define ALG_A5_NR_TO_RSL(A5_N) ((A5_N) >= 0 ? (A5_N)+1 : 0)
+#define ALG_A5_NR_TO_RSL(A5_N) ((int)(A5_N) >= 0 ? (A5_N)+1 : 0)
 #define ALG_A5_NR_TO_BSSAP(A5_N) ALG_A5_NR_TO_RSL(A5_N)
-#define ALG_A5_NR_TO_PERM_ALG_BITS(A5_N) ((A5_N) >= 0 ? 1<<(A5_N) : 0)
+#define ALG_A5_NR_TO_PERM_ALG_BITS(A5_N) ((int)(A5_N) >= 0 ? 1<<(A5_N) : 0)
 
 /* Up to 16 SI2quater are multiplexed; each fits 3 EARFCNS, so the practical maximum is 3*16.
  * The real maximum that fits in a total of 16 SI2quater rest octets also depends on the bits left by other SI2quater

