hw/openrisc: Fix masking in openrisc_pic_cpu_handler()

Consider the masking of PICSR and PICMR:

    ((cpu->env.picsr && (1 << i)) && (cpu->env.picmr && (1 << i)))

To correctly mask bits, we should use the bitwise AND "&" rather than
the logical AND "&&".  Also, the loop is not necessary for masking.
Simply use (cpu->env.picsr & cpu->env.picmr).

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Acked-by: Jia Liu <proljc@gmail.com>

hw/openrisc/pic_cpu.c

@@ -26,7 +26,6 @@ static void openrisc_pic_cpu_handler(void *opaque, int irq, int level)
 {
     OpenRISCCPU *cpu = (OpenRISCCPU *)opaque;
     CPUState *cs = CPU(cpu);
-    int i;
     uint32_t irq_bit = 1 << irq;
 
     if (irq > 31 || irq < 0) {
@@ -39,13 +38,11 @@ static void openrisc_pic_cpu_handler(void *opaque, int irq, int level)
         cpu->env.picsr &= ~irq_bit;
     }
 
-    for (i = 0; i < 32; i++) {
-        if ((cpu->env.picsr && (1 << i)) && (cpu->env.picmr && (1 << i))) {
-            cpu_interrupt(cs, CPU_INTERRUPT_HARD);
-        } else {
-            cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
-            cpu->env.picsr &= ~(1 << i);
-        }
+    if (cpu->env.picsr & cpu->env.picmr) {
+        cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+    } else {
+        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+        cpu->env.picsr = 0;
     }
 }