Fixed a bug in code generation discovered during testing at LASTI.

git-svn-id: https://redoubt.ligo-wa.caltech.edu/svn/advLigoRTS/trunk@3483 6dcd42c9-f523-4c6d-aada-af552506706e

src/epics/util/lib/EXC.pm

@@ -23,6 +23,7 @@ sub printHeaderStruct {
 	$::extraEXCmap{$key} = $::extraEXCcount;
 	$::extraEXCcount ++;
 	$::extraExcitations .= " $key";
+	return "";
 }
 
 # Print Epics variable definitions