legacy.c: fix memory leaks

contrib/pzstd/Makefile

@@ -134,7 +134,7 @@ debug: pzstd$(EXT) tests roundtrip
 
 .PHONY: tsan
 tsan: PZSTD_CCXXFLAGS += -fsanitize=thread -fPIC
-tsan: PZSTD_LDFLAGS   += -fsanitize=thread -pie
+tsan: PZSTD_LDFLAGS   += -fsanitize=thread
 tsan: debug
 
 .PHONY: asan

tests/legacy.c

@@ -65,6 +65,7 @@ int testSimpleAPI(void)
         return 1;
     }
 
+    free(output);
     DISPLAY("Simple API OK\n");
     return 0;
 }
@@ -118,6 +119,8 @@ int testStreamingAPI(void)
         }
     }
 
+    free(outBuff);
+    ZSTD_freeDStream(stream);
     DISPLAY("Streaming API OK\n");
     return 0;
 }