xtensa: provide proper assembler function boundaries with ENDPROC()

Use ENDPROC() to mark the end of assembler functions.

Signed-off-by: Chris Zankel <chris@zankel.net>
diff --git a/arch/xtensa/kernel/align.S b/arch/xtensa/kernel/align.S
index 934ae58..39d2f59 100644
--- a/arch/xtensa/kernel/align.S
+++ b/arch/xtensa/kernel/align.S
@@ -450,6 +450,7 @@
 1:	movi	a0, _user_exception
 	jx	a0
 
+ENDPROC(fast_unaligned)
 
 #endif /* XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION */