m68k: sun3: Remove unused orig_baddr in free_baddr()

When building with W=1:

    arch/m68k/sun3/sun3dvma.c: In function ‘free_baddr’:
    arch/m68k/sun3/sun3dvma.c:208:23: warning: variable ‘orig_baddr’ set but not used [-Wunused-but-set-variable]
      196 |         unsigned long orig_baddr;
	  |                       ^~~~~~~~~~

Fix this by removing the unused variable and assignment, which were
futile since their introduction in v2.4.5.2.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/c705b6186241dfe9a5bdcb71720b8697fa5c801f.1694613528.git.geert@linux-m68k.org

arch/m68k/sun3/sun3dvma.c

@@ -193,9 +193,7 @@ static inline int free_baddr(unsigned long baddr)
 	unsigned long len;
 	struct hole *hole;
 	struct list_head *cur;
-	unsigned long orig_baddr;
 
-	orig_baddr = baddr;
 	len = dvma_entry_use(baddr);
 	dvma_entry_use(baddr) = 0;
 	baddr &= DVMA_PAGE_MASK;