Add ASan and UBSan CI coverage

.gitea/workflows/ci.yaml

@@ -64,6 +64,22 @@ jobs:
               -I tests \
               tests/freestanding_fixture.c -o /tmp/freestanding_fixture.o
       - run: echo "🍏 This job's status is ${{ job.status }}."
+  sanitizer:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: dependencies
+        run: |
+          sudo apt-get update -y
+          sudo apt-get install -y cmake gcc moreutils
+      - name: build with AddressSanitizer and UBSan
+        run: |
+          cmake -S . -B build/asan -DAKERR_SANITIZE=address,undefined
+          cmake --build build/asan
+      - name: test with AddressSanitizer and UBSan
+        run: ctest --test-dir build/asan --output-on-failure
+      - run: echo "🍏 This job's status is ${{ job.status }}."
 
   coverage:
     runs-on: ubuntu-latest

src/error.c

@@ -676,7 +676,7 @@ static akerr_ErrorContext AKERR_NOIGNORE *akerr_reserve_status_range_locked(int
 			"must not overflow int)",
 			count, first_status, owner == NULL ? "(null)" : owner,
 			AKERR_MAX_STATUS_RANGE_OWNER_LENGTH);
-    last_status = first_status + count - 1;
+    last_status = first_status + (count - 1);
 
     for ( int i = 0; i < akerr_status_range_count; i++ ) {
 	if ( first_status <= akerr_status_ranges[i].last &&