get_descriptor() can now also safely be called with a descriptor less

than zero.
Supports now up to 64 file descriptors (just in case).


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4694 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/boot/loader/vfs.cpp

@@ -52,7 +52,7 @@ class Descriptor {
 		int32	fRefCount;
 };
 
-#define MAX_VFS_DESCRIPTORS 32
+#define MAX_VFS_DESCRIPTORS 64
 
 list gBootDevices;
 list gPartitions;
@@ -364,7 +364,7 @@ mount_boot_file_systems()
 static Descriptor *
 get_descriptor(int fd)
 {
-	if (fd >= MAX_VFS_DESCRIPTORS)
+	if (fd < 0 || fd >= MAX_VFS_DESCRIPTORS)
 		return NULL;
 
 	return gDescriptors[fd];