hostbits/xbits: free hostbit

Fix memory leak. Hostbits were not actually freed.

Bug #1975.

src/host-bit.c

@@ -123,6 +123,7 @@ static void HostBitRemove(Host *h, uint16_t idx)
     GenericVar *gv = HostGetStorageById(h, host_bit_id);
     if (gv) {
         GenericVarRemove(&gv, (GenericVar *)fb);
+        XBitFree(fb);
         HostSetStorageById(h, host_bit_id, gv);
     }
 }

src/util-var.c

@@ -36,7 +36,7 @@
 
 #include "util-debug.h"
 
-static void XBitFree(XBit *fb)
+void XBitFree(XBit *fb)
 {
     if (fb == NULL)
         return;

src/util-var.h

@@ -57,6 +57,8 @@ typedef struct XBit_ {
     uint32_t expire;
 } XBit;
 
+void XBitFree(XBit *);
+
 // A list of variables we try to resolve while parsing configuration file.
 // Helps to detect recursive declarations.
 typedef struct ResolvedVariable_ {