MIPS: Delete dead invocation of exception_exit().

panic() doesn't return so this call was useless.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
Reported-by: NAlexander Sverdlin <alexander.sverdlin@nsn.com>

arch/mips/kernel/traps.c

@@ -1242,7 +1242,6 @@ asmlinkage void do_mcheck(struct pt_regs *regs)
 	panic("Caught Machine Check exception - %scaused by multiple "
 	      "matching entries in the TLB.",
 	      (multi_match) ? "" : "not ");
-	exception_exit(prev_state);
 }
 
 asmlinkage void do_mt(struct pt_regs *regs)