build: fs_config_generate must open file in binary mode

Bug: 19908228
Change-Id: I2361b8af90b3729deb438e6a7a7179de12680b65
diff --git a/tools/fs_config/fs_config_generate.c b/tools/fs_config/fs_config_generate.c
index 87769c7..c06213f 100644
--- a/tools/fs_config/fs_config_generate.c
+++ b/tools/fs_config/fs_config_generate.c
@@ -82,7 +82,7 @@
         usage();
         exit(EXIT_FAILURE);
       }
-      fp = fopen(optarg, "w");
+      fp = fopen(optarg, "wb");
       if (fp == NULL) {
         fprintf(stderr, "Can not open \"%s\"\n", optarg);
         exit(EXIT_FAILURE);