Use correct mutex call in flow-vars code.

src/flow-var.c

@@ -66,14 +66,14 @@ void FlowVarAddStr(Flow *f, uint8_t idx, uint8_t *value, uint16_t size) {
     }
 
 out:
-    mutex_unlock(&f->m);
+    SCMutexUnlock(&f->m);
 }
 
 /* add a flowvar to the flow, or update it */
 void FlowVarAddInt(Flow *f, uint8_t idx, uint32_t value) {
     //printf("Adding flow var \"%s\" with value(%" PRId32 ") \"%s\"\n", name, size, value);
 
-    mutex_lock(&f->m);
+    SCMutexLock(&f->m);
 
     FlowVar *fv = FlowVarGet(f, idx);
     if (fv == NULL) {