small fixes in documentation and sandbox_getaddrinfo()

src/common/sandbox.c

@@ -892,7 +892,7 @@ sandbox_getaddrinfo(const char *name, struct addrinfo **res)
   }
   *res = NULL;
   *res = (struct addrinfo *)malloc(sizeof(struct addrinfo));
-  if (!res) {
+  if (*res == NULL) {
     return -2;
   }
 

src/common/sandbox.h

@@ -68,10 +68,10 @@ typedef int (*sandbox_filter_func_t)(scmp_filter_ctx ctx,
 
 /** Type that will be used in step 3 in order to manage multiple sandboxes.*/
 typedef struct {
-  // function pointers associated with the filter
+  /** function pointers associated with the filter */
   sandbox_filter_func_t *filter_func;
 
-  // filter function pointer parameters
+  /** filter function pointer parameters */
   sandbox_cfg_t *filter_dynamic;
 } sandbox_t;