Avoids memory leak with fuzz driver (#1233)

diff --git a/suite/fuzz/onefile.c b/suite/fuzz/onefile.c
index 3146cc0..74be306 100644
--- a/suite/fuzz/onefile.c
+++ b/suite/fuzz/onefile.c
@@ -38,11 +38,13 @@
     }
     if (fread(Data, Size, 1, fp) != 1) {
         fclose(fp);
+        free(Data);
         return 2;
     }
 
     //lauch fuzzer
     LLVMFuzzerTestOneInput(Data, Size);
+    free(Data);
     fclose(fp);
     return 0;
 }