[PATCH] wifi: iwlwifi: mvm: fix uninitialized variables in debugfs code

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The sscanf() function doesn't return negatives, it returns the number
of the number of input items successfully matched.  Fix the error
checking to avoid some uninitialized variable bugs.

Fixes: e5bf75dc46e1 ("wifi: iwlwifi: mvm: add a debugfs for (un)blocking EMLSR")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
index 17c97dfbc62a..88e78c798017 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
@@ -762,11 +762,9 @@ static ssize_t iwl_dbgfs_esr_disable_reason_write(struct ieee80211_vif *vif,
 	struct iwl_mvm *mvm = mvmvif->mvm;
 	u32 reason;
 	u8 block;
-	int ret;
 
-	ret = sscanf(buf, "%u %hhu", &reason, &block);
-	if (ret < 0)
-		return ret;
+	if (sscanf(buf, "%u %hhu", &reason, &block) != 2)
+		return -EINVAL;
 
 	if (hweight16(reason) != 1 || !(reason & IWL_MVM_BLOCK_ESR_REASONS))
 		return -EINVAL;
-- 
2.43.0





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