Add more test cases for GptInit() and fixed some bugs

src/platform/vboot_reference/cgptlib/gpt.h

Index: src/platform/vboot_reference/cgptlib/gpt.h
diff --git a/src/platform/vboot_reference/cgptlib/gpt.h b/src/platform/vboot_reference/cgptlib/gpt.h
index 95f0efba321c81ba581c2e9dfe8549f7d09122c9..5d49b17b73a02bf60606cbe03c8c22d679d378b8 100644
--- a/src/platform/vboot_reference/cgptlib/gpt.h
+++ b/src/platform/vboot_reference/cgptlib/gpt.h
@@ -17,15 +17,15 @@
 #define GPT_HEADER_REVISION 0x00010000
 
 #define GPT_ENT_TYPE_EFI \
-  {{Uuid: {0xc12a7328,0xf81f,0x11d2,0xba,0x4b,{0x00,0xa0,0xc9,0x3e,0xc9,0x3b}}}}
+  {{{0xc12a7328,0xf81f,0x11d2,0xba,0x4b,{0x00,0xa0,0xc9,0x3e,0xc9,0x3b}}}}
 #define GPT_ENT_TYPE_UNUSED \
-  {{Uuid: {0x00000000,0x0000,0x0000,0x00,0x00,{0x00,0x00,0x00,0x00,0x00,0x00}}}}
+  {{{0x00000000,0x0000,0x0000,0x00,0x00,{0x00,0x00,0x00,0x00,0x00,0x00}}}}
 #define GPT_ENT_TYPE_CHROMEOS_KERNEL \
-  {{Uuid: {0xfe3a2a5d,0x4f32,0x41a7,0xb7,0x25,{0xac,0xcc,0x32,0x85,0xa3,0x09}}}}
+  {{{0xfe3a2a5d,0x4f32,0x41a7,0xb7,0x25,{0xac,0xcc,0x32,0x85,0xa3,0x09}}}}
 #define GPT_ENT_TYPE_CHROMEOS_ROOTFS \
-  {{Uuid: {0x3cb8e202,0x3b7e,0x47dd,0x8a,0x3c,{0x7f,0xf2,0xa1,0x3c,0xfc,0xec}}}}
+  {{{0x3cb8e202,0x3b7e,0x47dd,0x8a,0x3c,{0x7f,0xf2,0xa1,0x3c,0xfc,0xec}}}}
 #define GPT_ENT_TYPE_CHROMEOS_RESERVED \
-  {{Uuid: {0x2e0a753d,0x9e48,0x43b0,0x83,0x37,{0xb1,0x51,0x92,0xcb,0x1b,0x5e}}}}
+  {{{0x2e0a753d,0x9e48,0x43b0,0x83,0x37,{0xb1,0x51,0x92,0xcb,0x1b,0x5e}}}}
 
 #define UUID_NODE_LEN 6
 #define GUID_SIZE 16
@@ -44,7 +44,7 @@ typedef struct {
       uint8_t node[UUID_NODE_LEN];
     } Uuid;
     uint8_t raw[GUID_SIZE];
-  };
+  } u;
 } __attribute__((packed)) Guid;
 
 /* GPT header defines how many partitions exist on a drive and sectors managed.