htp: destroy atomic vars

Atomic vars declared in app-layer-htp-mem.c were not
destroyed when suricata is shutdown.

src/app-layer-htp-mem.c

@@ -195,6 +195,12 @@ void HTPFree(void *ptr, size_t size)
     HTPDecrMemuse((uint64_t)size);
 }
 
+void HTPDestroyMemcap(void)
+{
+    SC_ATOMIC_DESTROY(htp_config_memcap);
+    SC_ATOMIC_DESTROY(htp_memcap);
+    SC_ATOMIC_DESTROY(htp_memuse);
+}
 
 /**
  * @}

src/app-layer-htp-mem.h

@@ -22,6 +22,7 @@ void *HTPMalloc(size_t size);
 void *HTPCalloc(size_t n, size_t size);
 void *HTPRealloc(void *ptr, size_t orig_size, size_t size);
 void HTPFree(void *ptr, size_t size);
+void HTPDestroyMemcap(void);
 
 int HTPSetMemcap(uint64_t size);
 uint64_t HTPGetMemcap(void);

src/app-layer-htp.c

@@ -1916,6 +1916,7 @@ void HTPFreeConfig(void)
         htp_config_destroy(htprec->cfg);
         SCFree(htprec);
     }
+    HTPDestroyMemcap();
     SCReturn;
 }