[test] fix a leak

src/auto_mem.hh

@@ -183,6 +183,9 @@ public:
     }
 
     void expand_by(size_t amount) {
+        if (amount == 0) {
+            return;
+        }
         auto new_size = this->ab_size + amount;
         auto new_buffer = (char *) realloc(this->ab_buffer, new_size);
 

src/base/lnav.gzip.cc

@@ -78,6 +78,7 @@ Result<auto_buffer, std::string> uncompress(const std::string& src,
         if (err == Z_STREAM_END) {
             done = true;
         } else if (err != Z_OK) {
+            inflateEnd(&strm);
             return Err(fmt::format("unable to uncompress: {} -- {}",
                                    src, strm.msg ? strm.msg : zError(err)));
         }