Patch by Bryce Groff: Fixed return values of the identify() hook.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31906 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/file_systems/ext2/kernel_interface.cpp

@@ -50,7 +50,7 @@ ext2_identify_partition(int fd, partition_data *partition, void **_cookie)
 	ext2_super_block superBlock;
 	status_t status = Volume::Identify(fd, &superBlock);
 	if (status != B_OK)
-		return status;
+		return -1;
 
 	identify_cookie *cookie = new identify_cookie;
 	memcpy(&cookie->super_block, &superBlock, sizeof(ext2_super_block));

src/add-ons/kernel/partitioning_systems/efi/efi_gpt.cpp

@@ -457,7 +457,7 @@ efi_gpt_identify_partition(int fd, partition_data *partition, void **_cookie)
 	status_t status = header->InitCheck();
 	if (status < B_OK) {
 		delete header;
-		return status;
+		return -1;
 	}
 
 	*_cookie = header;