Fix potential division by zero in LRU test mode in redis-cli (#14369)

This PR resolves a potential division-by-zero issue in the `redis-cli`
LRU test mode (`--lru-test`), as reported by the Linux Verification
Center.

Fixes #14361

src/redis-cli.c

@@ -9855,11 +9855,12 @@ static void LRUTestMode(void) {
             }
         }
         /* Print stats. */
+        long long total_gets = hits + misses;
         printf(
             "%lld Gets/sec | Hits: %lld (%.2f%%) | Misses: %lld (%.2f%%)\n",
             hits+misses,
-            hits, (double)hits/(hits+misses)*100,
-            misses, (double)misses/(hits+misses)*100);
+            hits, total_gets > 0 ? (double)hits/total_gets*100 : 0.0,
+            misses, total_gets > 0 ? (double)misses/total_gets*100 : 0.0);
     }
     exit(0);
 }