msm: bam_dmux: fix registration of platform devices

Fix incorrect checking of return code for platform
device registration.

CRs-fixed: 316420
Change-Id: Ic2ef5dae096ab94244994b1514d73d04bb68af46
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>
diff --git a/drivers/net/msm_rmnet_bam.c b/drivers/net/msm_rmnet_bam.c
index aeb85dc..e617aa5 100644
--- a/drivers/net/msm_rmnet_bam.c
+++ b/drivers/net/msm_rmnet_bam.c
@@ -737,8 +737,11 @@
 		bam_rmnet_drivers[n].driver.name = tempname;
 		bam_rmnet_drivers[n].driver.owner = THIS_MODULE;
 		ret = platform_driver_register(&bam_rmnet_drivers[n]);
-		if (!ret)
+		if (ret) {
+			pr_err("%s: registration failed n=%d rc=%d\n",
+					__func__, n, ret);
 			return ret;
+		}
 	}
 	return 0;
 }