[PATCH] iwlwifi: rs: fixup the return value type of iwl_legacy_rate_to_fw_idx()

[cgel . zte]

From: Ye Guojin <ye.guojin@xxxxxxxxxx>

This was found by coccicheck:
./drivers/net/wireless/intel/iwlwifi/fw/rs.c, 147, 10-21, WARNING
Unsigned expression compared with zero legacy_rate < 0

Reported-by: Zeal Robot <zealci@xxxxxxxxxx>
Signed-off-by: Ye Guojin <ye.guojin@xxxxxxxxxx>
---
 drivers/net/wireless/intel/iwlwifi/fw/api/rs.h | 2 +-
 drivers/net/wireless/intel/iwlwifi/fw/rs.c     | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/rs.h b/drivers/net/wireless/intel/iwlwifi/fw/api/rs.h
index a09081d7ed45..7794cd6d289d 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/api/rs.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/api/rs.h
@@ -710,7 +710,7 @@ struct iwl_lq_cmd {
 
 u8 iwl_fw_rate_idx_to_plcp(int idx);
 u32 iwl_new_rate_from_v1(u32 rate_v1);
-u32 iwl_legacy_rate_to_fw_idx(u32 rate_n_flags);
+int iwl_legacy_rate_to_fw_idx(u32 rate_n_flags);
 const struct iwl_rate_mcs_info *iwl_rate_mcs(int idx);
 const char *iwl_rs_pretty_ant(u8 ant);
 const char *iwl_rs_pretty_bw(int bw);
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/rs.c b/drivers/net/wireless/intel/iwlwifi/fw/rs.c
index a21c3befd93b..3850881210e6 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/rs.c
@@ -142,7 +142,7 @@ u32 iwl_new_rate_from_v1(u32 rate_v1)
 		}
 	/* if legacy format */
 	} else {
-		u32 legacy_rate = iwl_legacy_rate_to_fw_idx(rate_v1);
+		int legacy_rate = iwl_legacy_rate_to_fw_idx(rate_v1);
 
 		WARN_ON(legacy_rate < 0);
 		rate_v2 |= legacy_rate;
@@ -172,7 +172,7 @@ u32 iwl_new_rate_from_v1(u32 rate_v1)
 }
 IWL_EXPORT_SYMBOL(iwl_new_rate_from_v1);
 
-u32 iwl_legacy_rate_to_fw_idx(u32 rate_n_flags)
+int iwl_legacy_rate_to_fw_idx(u32 rate_n_flags)
 {
 	int rate = rate_n_flags & RATE_LEGACY_RATE_MSK_V1;
 	int idx;
-- 
2.25.1