manifest: fix file size check in resign_image

This will allow to use size variable in < 0 checks

Signed-off-by: Adrian Bonislawski <adrian.bonislawski@intel.com>

src/manifest.c

@@ -1440,7 +1440,8 @@ int resign_image(struct image *image)
 {
 	int key_size, key_file_size;
 	void *buffer = NULL;
-	size_t size, read;
+	size_t read;
+	int32_t size;
 	FILE *in_file;
 	int ret, i;
 
@@ -1487,7 +1488,7 @@ int resign_image(struct image *image)
 	/* read file into buffer */
 	read = fread(buffer, 1, size, in_file);
 	if (read != size) {
-		fprintf(stderr, "error: unable to read %zu bytes from %s err %d\n",
+		fprintf(stderr, "error: unable to read %d bytes from %s err %d\n",
 					size, image->in_file, errno);
 		ret = errno;
 		goto out;