[incfs] return error if restorecon fails

Addressing comments in ag/10310771.

Test: atest libincfs-test
BUG: 133435829
Change-Id: I4ef4257dee3e7014f4522150a8e8040850fda5c9
Merged-In: I4ef4257dee3e7014f4522150a8e8040850fda5c9
diff --git a/incfs/incfs.cpp b/incfs/incfs.cpp
index 4c3b33b..6a48cfa 100644
--- a/incfs/incfs.cpp
+++ b/incfs/incfs.cpp
@@ -427,9 +427,10 @@
         return {-error, -error, -error};
     }
 
-    int res = selinux_android_restorecon(targetDir, SELINUX_ANDROID_RESTORECON_RECURSE);
-    if (res != 0) {
-        PLOG(ERROR) << "[incfs] Failed to restorecon: " << res;
+    if (const auto err = selinux_android_restorecon(targetDir, SELINUX_ANDROID_RESTORECON_RECURSE);
+        err != 0) {
+        PLOG(ERROR) << "[incfs] Failed to restorecon: " << err;
+        return {err, err, err};
     }
 
     registry().addRoot(targetDir);
diff --git a/incfs/tests/incfs_test.cpp b/incfs/tests/incfs_test.cpp
index 0e299e5..eea8ddd 100644
--- a/incfs/tests/incfs_test.cpp
+++ b/incfs/tests/incfs_test.cpp
@@ -64,15 +64,15 @@
             ASSERT_TRUE(control_.cmd >= 0) << "Expected >= 0 got " << control_.cmd;
             ASSERT_TRUE(control_.pendingReads >= 0);
             ASSERT_TRUE(control_.logs >= 0);
-            checkRestoreconResult(mountPath(".pending_reads"));
-            checkRestoreconResult(mountPath(".log"));
+            checkRestoreconResult(mountPath(INCFS_PENDING_READS_FILENAME));
+            checkRestoreconResult(mountPath(INCFS_LOG_FILENAME));
         }
     }
 
     static void checkRestoreconResult(std::string_view path) {
         char* ctx = nullptr;
         ASSERT_NE(-1, getfilecon(path.data(), &ctx));
-        ASSERT_NE("u:object_r:unlabeled:s0", std::string(ctx));
+        ASSERT_EQ("u:object_r:shell_data_file:s0", std::string(ctx));
         freecon(ctx);
     }