MIPS: Loongson: irq.c: Misc cleanups

* Remove unnecessary 'if (int_status & (1 <<10))' statement
* s/if (foo != 0)/if (foo)/
* Remove unused 'inst_status &= ~(1 << i);' line

Signed-off-by: Shinya Kuribayashi <skuribay@pobox.com>
To: wuzhangjin@gmail.com
CC: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1433/
Acked-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/loongson/common/irq.c

@@ -21,19 +21,16 @@ void bonito_irqdispatch(void)
 
 	/* workaround the IO dma problem: let cpu looping to allow DMA finish */
 	int_status = LOONGSON_INTISR;
-	if (int_status & (1 << 10)) {
-		while (int_status & (1 << 10)) {
-			udelay(1);
-			int_status = LOONGSON_INTISR;
-		}
+	while (int_status & (1 << 10)) {
+		udelay(1);
+		int_status = LOONGSON_INTISR;
 	}
 
 	/* Get pending sources, masked by current enables */
 	int_status = LOONGSON_INTISR & LOONGSON_INTEN;
 
-	if (int_status != 0) {
+	if (int_status) {
 		i = __ffs(int_status);
-		int_status &= ~(1 << i);
 		do_IRQ(LOONGSON_IRQ_BASE + i);
 	}
 }