Delete useless 'extern' qualifiers for functions

'extern' qualifier is useless for function declarations. Delete
them.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/fsdev/qemu-fsdev.h b/fsdev/qemu-fsdev.h
index 6c27881..a704043 100644
--- a/fsdev/qemu-fsdev.h
+++ b/fsdev/qemu-fsdev.h
@@ -49,7 +49,7 @@
     QTAILQ_ENTRY(FsTypeListEntry) next;
 } FsTypeListEntry;
 
-extern int qemu_fsdev_add(QemuOpts *opts);
-extern FsTypeEntry *get_fsdev_fsentry(char *id);
+int qemu_fsdev_add(QemuOpts *opts);
+FsTypeEntry *get_fsdev_fsentry(char *id);
 extern FileOperations local_ops;
 #endif