change(ble): Don't allocate if not needed when resizing

lib/sdk/Libraries/BTLE/stack/ble-host/sources/stack/att/atts_dyn.c

@@ -432,7 +432,11 @@ uint8_t AttsDynResize(uint16_t handle, uint16_t maxLen)
   /* find attribute */
   if ((pAttr = attsFindByHandle(handle, &pGroup)) != NULL)
   {
-    /* Allocate a buffer for the value of the attribute */
+    /* Only alllocate a value if there is a change and if
+     * it was allocated before. */
+    if(pAttr->pValue && pAttr->maxLen != maxLen )
+    {
+      /* Allocate new buffer for the value of the attribute */
       pValue = attsDynAlloc(maxLen);
       WSF_ASSERT(pValue);
 
@@ -441,10 +445,12 @@ uint8_t AttsDynResize(uint16_t handle, uint16_t maxLen)
         return ATT_ERR_MEMORY;
       }
 
-    pAttr->maxLen = maxLen;
       pAttr->pValue = pValue;
       memset(pValue, 0, maxLen);
     }
+
+    pAttr->maxLen = maxLen;
+  }
   /* else attribute not found */
   else
   {