Move the definition of mkdirlisthd from header to C file.

Reviewed by:	mckusick
Tested by:	pho

sys/ufs/ffs/ffs_softdep.c

@@ -691,6 +691,8 @@ static struct malloc_type *memtype[] = {
 	M_JTRUNC
 };
 
+static LIST_HEAD(mkdirlist, mkdir) mkdirlisthd;
+
 #define DtoM(type) (memtype[type])
 
 /*

sys/ufs/ffs/softdep.h

@@ -657,7 +657,6 @@ struct mkdir {
 	struct	buf *md_buf;		/* MKDIR_BODY: buffer holding dir */
 	LIST_ENTRY(mkdir) md_mkdirs;	/* list of all mkdirs */
 };
-LIST_HEAD(mkdirlist, mkdir) mkdirlisthd;
 
 /*
  * A "dirrem" structure describes an operation to decrement the link