m68k: use some direct calls to ret_from_exception in entry code

The ret_from_excption code is referenced by its function name, or by a label
set at the start of its code. The non-MMU code can share some of this code
if we make direct calls to ret_from_exception instead of the associated label.
The effected function paths are: buserr, trap and ret_from_fork. So change
these to branch directly to ret_from_exception.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/kernel/entry_mm.S

@@ -57,7 +57,7 @@ ENTRY(buserr)
 	movel	%sp,%sp@-		| stack frame pointer argument
 	bsrl	buserr_c
 	addql	#4,%sp
-	jra	.Lret_from_exception
+	jra	ret_from_exception
 
 ENTRY(trap)
 	SAVE_ALL_INT
@@ -65,7 +65,7 @@ ENTRY(trap)
 	movel	%sp,%sp@-		| stack frame pointer argument
 	bsrl	trap_c
 	addql	#4,%sp
-	jra	.Lret_from_exception
+	jra	ret_from_exception
 
 	| After a fork we jump here directly from resume,
 	| so that %d1 contains the previous task
@@ -74,7 +74,7 @@ ENTRY(ret_from_fork)
 	movel	%d1,%sp@-
 	jsr	schedule_tail
 	addql	#4,%sp
-	jra	.Lret_from_exception
+	jra	ret_from_exception
 
 do_trace_entry:
 	movel	#-ENOSYS,%sp@(PT_OFF_D0)| needed for strace