Fix assertion in GIC ITS helper

This patch fixes an assertion check in the GICv3 ITS helper function.

Change-Id: I75f50d7bf6d87c12c6e24a07c9a9889e5facf4a5
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
diff --git a/drivers/arm/gic/v3/gicv3_main.c b/drivers/arm/gic/v3/gicv3_main.c
index 7282bdc..1a018d8 100644
--- a/drivers/arm/gic/v3/gicv3_main.c
+++ b/drivers/arm/gic/v3/gicv3_main.c
@@ -483,7 +483,7 @@
 
 	/* Assert that the GITS is disabled and quiescent */
 	assert((gits_read_ctlr(gits_base) & GITS_CTLR_ENABLED_BIT) == 0);
-	assert((gits_read_ctlr(gits_base) & GITS_CTLR_QUIESCENT_BIT) == 1);
+	assert((gits_read_ctlr(gits_base) & GITS_CTLR_QUIESCENT_BIT) != 0);
 
 	gits_write_cbaser(gits_base, its_ctx->gits_cbaser);
 	gits_write_cwriter(gits_base, its_ctx->gits_cwriter);