[PATCH] um: Fix return value of start_idle_thread

[Richard Weinberger]

While the function will never returns, gcc will warns.
Add a return statement to make gcc happy.
Before f44f1e7da7c8 we never noticed because gcc knows that longjmp does
not return.

arch/um/os-Linux/skas/process.c: In function ‘start_idle_thread’:
arch/um/os-Linux/skas/process.c:613:1: warning: control reaches end of non-void 
function [-Wreturn-type]

Fixes: f44f1e7da7c8 ("um: Avoid longjmp/setjmp symbol clashes with 
libpthread.a")
Signed-off-by: Richard Weinberger <rich...@nod.at>
---
 arch/um/os-Linux/skas/process.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index c94c3bd70ccd..d41fdf686a5f 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -610,6 +610,10 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf)
                fatal_sigsegv();
        }
        longjmp(*switch_buf, 1);
+
+       /* unreachable */
+       fatal_sigsegv();
+       return 0;
 }
 
 void initial_thread_cb_skas(void (*proc)(void *), void *arg)
-- 
2.13.6