Release mutex on error.

Signed-off-by: Tom Eastep <teastep@shorewall.net>

Shorewall-core/lib.common

@@ -65,6 +65,7 @@ startup_error() # $* = Error Message
 	esac
     fi
 
+    mutex_off
     kill $$
     exit 2
 }

Shorewall/Perl/lib.core

@@ -419,6 +419,7 @@ fatal_error()
 
     stop_firewall
     [ -n "$TEMPFILE" ] && rm -f $TEMPFILE
+    mutex_off
     exit 2
 }