mips/oprofile: Fix fallthrough placement

We want neither
"
include/linux/compiler_attributes.h:201:41: warning: statement will never
be executed [-Wswitch-unreachable]
  201 | # define fallthrough __attribute__((__fallthrough__))
      |                      ^~~~~~~~~~~~~
"
nor
"
include/linux/compiler_attributes.h:201:41: warning: attribute
'fallthrough' not preceding a case label or default label
  201 | # define fallthrough __attribute__((__fallthrough__))
      |                      ^~~~~~~~~~~~~
"

It's not worth adding one more macro. Let's simply place the fallthrough
in between the expansions.

Fixes: c9b02990 ("MIPS: Use fallthrough for arch/mips")
Cc: stable@vger.kernel.org
Signed-off-by: He Zhe <zhe.he@windriver.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/oprofile/op_model_mipsxx.c

@@ -245,7 +245,6 @@ static int mipsxx_perfcount_handler(void)
 
 	switch (counters) {
 #define HANDLE_COUNTER(n)						\
-	fallthrough;							\
 	case n + 1:							\
 		control = r_c0_perfctrl ## n();				\
 		counter = r_c0_perfcntr ## n();				\
@@ -256,8 +255,11 @@ static int mipsxx_perfcount_handler(void)
 			handled = IRQ_HANDLED;				\
 		}
 	HANDLE_COUNTER(3)
+	fallthrough;
 	HANDLE_COUNTER(2)
+	fallthrough;
 	HANDLE_COUNTER(1)
+	fallthrough;
 	HANDLE_COUNTER(0)
 	}