IPMI: Update the dbus object for soft power off with underscores

Fixes openbmc/phosphor-host-ipmid#102

Change-Id: I3e7456401b7265a51578f9aa08bef2ae3f326849
Signed-off-by: Vishwanatha Subbanna <vishwa@linux.vnet.ibm.com>
diff --git a/configure.ac b/configure.ac
index 422f0e1..882b01e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -88,7 +88,7 @@
     # Service dbus root
     [AC_ARG_VAR(SOFTOFF_OBJPATH, [The SoftPowerOff Dbus root])]
     AS_IF([test "x$SOFTOFF_OBJPATH" == "x"],
-          [SOFTOFF_OBJPATH="/xyz/openbmc_project/ipmi/internal/softpoweroff"])
+          [SOFTOFF_OBJPATH="/xyz/openbmc_project/ipmi/internal/soft_power_off"])
     [AC_DEFINE_UNQUOTED([SOFTOFF_OBJPATH], ["$SOFTOFF_OBJPATH"], [The SoftPowerOff Dbus root])]
 
     # Timeouts in SECONDS for SoftPowerOff protocol