fix programmingPin index for removeFabrics (#20944)

* fix programmingPin index for removeFabrics

* rerun ci

Author: mykrupp

examples/lock-app/efr32/src/LockManager.cpp

@@ -106,12 +106,10 @@ bool LockManager::IsValidUserIndex(uint16_t userIndex)
 
 bool LockManager::IsValidCredentialIndex(uint16_t credentialIndex, DlCredentialType type)
 {
-    // appclusters, 5.2.6.3.1: 0 is allowed index for Programming PIN credential only
     if (DlCredentialType::kProgrammingPIN == type)
     {
-        return (0 == credentialIndex);
+        return (0 == credentialIndex); // 0 is required index for Programming PIN
     }
-
     return (credentialIndex < kMaxCredentialsPerUser);
 }
 
@@ -406,19 +404,19 @@ bool LockManager::GetCredential(chip::EndpointId endpointId, uint16_t credential
                                 EmberAfPluginDoorLockCredentialInfo & credential)
 {
 
-    VerifyOrReturnValue(IsValidCredentialIndex(--credentialIndex, credentialType), false); // indices are one-indexed
+    if (DlCredentialType::kProgrammingPIN == credentialType)
+    {
+        VerifyOrReturnValue(IsValidCredentialIndex(credentialIndex, credentialType),
+                            false); // programming pin index is only index allowed to contain 0
+    }
+    else
+    {
+        VerifyOrReturnValue(IsValidCredentialIndex(--credentialIndex, credentialType), false); // otherwise, indices are one-indexed
+    }
 
     ChipLogProgress(Zcl, "Lock App: LockManager::GetCredential [credentialType=%u], credentialIndex=%d",
                     to_underlying(credentialType), credentialIndex);
 
-    if (credentialType == DlCredentialType::kProgrammingPIN)
-    {
-        ChipLogError(Zcl, "Programming user not supported [credentialType=%u], credentialIndex=%d", to_underlying(credentialType),
-                     credentialIndex);
-
-        return true;
-    }
-
     const auto & credentialInStorage = mLockCredentials[credentialIndex];
 
     credential.status = credentialInStorage.status;
@@ -449,7 +447,15 @@ bool LockManager::SetCredential(chip::EndpointId endpointId, uint16_t credential
                                 const chip::ByteSpan & credentialData)
 {
 
-    VerifyOrReturnValue(IsValidCredentialIndex(--credentialIndex, credentialType), false); // indices are one-indexed
+    if (DlCredentialType::kProgrammingPIN == credentialType)
+    {
+        VerifyOrReturnValue(IsValidCredentialIndex(credentialIndex, credentialType),
+                            false); // programming pin index is only index allowed to contain 0
+    }
+    else
+    {
+        VerifyOrReturnValue(IsValidCredentialIndex(--credentialIndex, credentialType), false); // otherwise, indices are one-indexed
+    }
 
     ChipLogProgress(Zcl,
                     "Door Lock App: LockManager::SetCredential "