detect/port: make DetectPortInit non static

as this fn will be called upon and further used by other files later on.

Ticket 6792
Bug 6414

src/detect-engine-port.c

@@ -64,7 +64,7 @@ static bool DetectPortIsValidRange(char *, uint16_t *);
  *
  * \retval dp newly created DetectPort on success; or NULL in case of error.
  */
-static DetectPort *DetectPortInit(void)
+DetectPort *DetectPortInit(void)
 {
     DetectPort *dp = SCCalloc(1, sizeof(DetectPort));
     if (unlikely(dp == NULL))

src/detect-engine-port.h

@@ -38,6 +38,7 @@ bool DetectPortListsAreEqual(DetectPort *list1, DetectPort *list2);
 void DetectPortPrint(DetectPort *);
 void DetectPortPrintList(DetectPort *head);
 int DetectPortCmp(DetectPort *, DetectPort *);
+DetectPort *DetectPortInit(void);
 void DetectPortFree(const DetectEngineCtx *de_ctx, DetectPort *);
 
 int DetectPortTestConfVars(void);