hal: Add the missing 'else' for mixer_paths filename selection

Fix the minor issue in function of query_platform. The 'else' is
missing, which causes that the mixer_paths file name of all the
8916 boards will be overwritten by the default one.

Change-Id: If105e38537f5d4d5d3f52dfc64ac62f11e829bbf
CRs-Fixed: 668629
diff --git a/hal/msm8916/platform.c b/hal/msm8916/platform.c
index ab858f8..6fd0530 100644
--- a/hal/msm8916/platform.c
+++ b/hal/msm8916/platform.c
@@ -417,7 +417,7 @@
                  sizeof("msm8x16-skui-snd-card"))) {
         strlcpy(mixer_xml_path, MIXER_XML_PATH_QRD_SKUI,
                 sizeof(MIXER_XML_PATH_QRD_SKUI));
-    } if (!strncmp(snd_card_name, "msm8939-snd-card-mtp",
+    } else if (!strncmp(snd_card_name, "msm8939-snd-card-mtp",
                  sizeof("msm8939-snd-card-mtp"))) {
         strlcpy(mixer_xml_path, MIXER_XML_PATH,
                 sizeof(MIXER_XML_PATH));