psu-ng: Remove unnecessary debug trace

The "release() line" trace was added as a DEBUG journal trace. It was
thought that this could be useful in debugging situations, but some
recent testing with that enabled shows that this is not the case.

With the power supply daemon monitoring the GPIO presence lines once a
second, and four possible lines to monitor, the tracing is QUITE
excessive.

Signed-off-by: B. J. Wyman <bjwyman@gmail.com>
Change-Id: Ib6ae27e5aff108e17cd7ebc8215126bf1a8e7d5e
diff --git a/phosphor-power-supply/util.cpp b/phosphor-power-supply/util.cpp
index c64de33..f80bac7 100644
--- a/phosphor-power-supply/util.cpp
+++ b/phosphor-power-supply/util.cpp
@@ -60,7 +60,6 @@
             throw;
         }
 
-        log<level::DEBUG>("release() line");
         line.release();
     }
     catch (std::exception& e)