target/mips: Style improvements in mips_int.c

Fixes mostly errors and warnings reported by 'checkpatch.pl -f'.

Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: Aleksandar Rikalo <arikalo@wavecomp.com>
Message-Id: <1566216496-17375-15-git-send-email-aleksandar.markovic@rt-rk.com>

hw/mips/mips_int.c

@@ -35,8 +35,9 @@ static void cpu_mips_irq_request(void *opaque, int irq, int level)
     CPUState *cs = CPU(cpu);
     bool locked = false;
 
-    if (irq < 0 || irq > 7)
+    if (irq < 0 || irq > 7) {
         return;
+    }
 
     /* Make sure locking works even if BQL is already held by the caller */
     if (!qemu_mutex_iothread_locked()) {