Mark switch cases where we are expecting to fall through.

Fix the following warning through the use of the new the new
pseudo-keyword fallthrough;

arch/nios2/kernel/signal.c:254:12: warning: this statement may fall through 
[-Wimplicit-fallthrough=]
  254 |    restart = -2;
      |    ~~~~~~~~^~~~
arch/nios2/kernel/signal.c:255:3: note: here
  255 |   case ERESTARTNOHAND:
      |   ^~~~

Reported-by: Christian Brauner <[email protected]>
Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
 arch/nios2/kernel/signal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/nios2/kernel/signal.c b/arch/nios2/kernel/signal.c
index a42dd09c65783..d8a087cf2b424 100644
--- a/arch/nios2/kernel/signal.c
+++ b/arch/nios2/kernel/signal.c
@@ -252,6 +252,7 @@ static int do_signal(struct pt_regs *regs)
                switch (retval) {
                case ERESTART_RESTARTBLOCK:
                        restart = -2;
+                       fallthrough;
                case ERESTARTNOHAND:
                case ERESTARTSYS:
                case ERESTARTNOINTR:
-- 
2.27.0

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