fix leaks in tests and extend a bit the timeout for ASAN mode

tests/CMakeLists.txt

@@ -1,5 +1,5 @@
 if (BUILD_TEST)
-	SET(DART_TESTING_TIMEOUT 5)
+	SET(DART_TESTING_TIMEOUT 15)
 
 	INCLUDE(Dart)
 
@@ -97,5 +97,4 @@ if (BUILD_TEST)
 	FOREACH(test_dir ${TESTS_DIRS})
 		add_subdirectory (${test_dir})
 	ENDFOREACH(test_dir)
-
 endif (BUILD_TEST)

tests/gdimagefill/bug00002_1.c

@@ -21,6 +21,7 @@ int main()
 
 	file = gdTestTempFile("bug00002_1.png");
 	fp = fopen(file, "wb");
+	free(file);
 	if (fp == NULL) {
 		gdTestErrorMsg("Cannot create image from <%s>\n", file);
 		gdImageDestroy(im);

tests/gdimagestringft/bug00615.c

@@ -20,6 +20,7 @@ int main()
     char *res = gdImageStringFT(im, rect, fg, path, 12, 0, 10, 10, "");
 
     gdTestAssert(res == NULL);
-
+    free(path);
+    gdImageDestroy(im);
     return gdNumFailures();
 }

tests/gif/gif_nocolormaps.c

@@ -20,6 +20,7 @@ int main()
 	im = gdImageCreateFromGif(fp);
 	gdTestAssert(im != NULL);
 	fclose(fp);
+    gdImageDestroy(im);
 
 	return gdNumFailures();
 }

tests/heif/heif_im2im.c

@@ -11,9 +11,9 @@
 
 int main()
 {
-	gdImagePtr src, dst;
+	gdImagePtr src = NULL, dst = NULL;
 	int r, g, b;
-	void *p;
+	void *p = NULL;
 	int size = 0;
 	CuTestImageResult result = {0, 0};