Print the errno from a fail in the journal

When a file access fails, print the errno of the failure in the same
journal entry the filename is already printed.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I20d268f563cf1bbfa2a5f9780c02998d075f5275
diff --git a/targets.hpp b/targets.hpp
index c1a2feb..51e98a5 100644
--- a/targets.hpp
+++ b/targets.hpp
@@ -154,9 +154,9 @@
                     metadata::CALLOUT_ERRNO(e.code().value()),
                     metadata::CALLOUT_DEVICE_PATH(devPath.c_str()));
 
-                log<level::INFO>(
-                    fmt::format("Failing sysfs file: {}", sysfsFullPath)
-                        .c_str());
+                log<level::INFO>(fmt::format("Failing sysfs file: {} errno: {}",
+                                             sysfsFullPath, e.code().value())
+                                     .c_str());
             }
 
             static constexpr bool deferSignals = true;