arm: msm: return error pointer in vreg_get if vreg not found

Signed-off-by: Steve Muckle <smuckle@quicinc.com>
diff --git a/arch/arm/mach-msm/vreg.c b/arch/arm/mach-msm/vreg.c
index fcb0b9f..a839e19 100644
--- a/arch/arm/mach-msm/vreg.c
+++ b/arch/arm/mach-msm/vreg.c
@@ -70,7 +70,7 @@
 		if (!strcmp(vregs[n].name, id))
 			return vregs + n;
 	}
-	return 0;
+	return ERR_PTR(-ENOENT);
 }
 
 void vreg_put(struct vreg *vreg)