sca: remove a unused variable

- Eclipse was giving me errors on the log_stderr that is part of the LM_
statements. I was adding them to each file so I could see if I was
creating syntax errors. This one got overlooked.

modules/sca/sca_util.c

@@ -24,7 +24,7 @@
 #include "sca_util.h"
 
 #include "../../parser/sdp/sdp.h"
-extern int log_stderr;
+
 int sca_get_msg_method(sip_msg_t *msg)
 {
 	assert(msg != NULL);