scsi: message: fusion: Mark mpt_halt_firmware() __noreturn

mpt_halt_firmware() doesn't return.  Mark it as such.

Fixes the following warnings:

  vmlinux.o: warning: objtool: mptscsih_abort+0x7f4: unreachable instruction
  vmlinux.o: warning: objtool: mptctl_timeout_expired+0x310: unreachable instruction
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Mark Rutland <mark.rutland@arm.com>
Debugged-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/d8129817423422355bf30e90dadc6764261b53e0.1681342859.git.jpoimboe@kernel.org

drivers/message/fusion/mptbase.c

@@ -6935,7 +6935,7 @@ EXPORT_SYMBOL(mpt_clear_taskmgmt_in_progress_flag);
  *	@ioc: Pointer to MPT_ADAPTER structure
  *
  **/
-void
+void __noreturn
 mpt_halt_firmware(MPT_ADAPTER *ioc)
 {
 	u32	 ioc_raw_state;

drivers/message/fusion/mptbase.h

@@ -945,7 +945,7 @@ extern int	mpt_raid_phys_disk_get_num_paths(MPT_ADAPTER *ioc,
 		u8 phys_disk_num);
 extern int	 mpt_set_taskmgmt_in_progress_flag(MPT_ADAPTER *ioc);
 extern void	 mpt_clear_taskmgmt_in_progress_flag(MPT_ADAPTER *ioc);
-extern void     mpt_halt_firmware(MPT_ADAPTER *ioc);
+extern void __noreturn mpt_halt_firmware(MPT_ADAPTER *ioc);
 
 
 /*

tools/objtool/check.c

@@ -219,6 +219,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"lbug_with_loc",
 		"machine_real_restart",
 		"make_task_dead",
+		"mpt_halt_firmware",
 		"nmi_panic_self_stop",
 		"panic",
 		"panic_smp_self_stop",