um: Add missing apply_returns()

Implement apply_returns() stub for UM, just like all the other patching
routines.

Fixes: 15e6722 ("x86: Undo return-thunk damage")
Reported-by: Randy Dunlap <[email protected])
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

Author: Peter Zijlstra

arch/um/kernel/um_arch.c

@@ -432,6 +432,10 @@ void apply_retpolines(s32 *start, s32 *end)
 {
 }
 
+void apply_returns(s32 *start, s32 *end)
+{
+}
+
 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
 {
 }