wlan: Remove ineffective comparison of unsigned value

Comparison of an unsigned value to zero that is always false
To mitigate issue removed ineffective comparison.

CRs-Fixed: 818894
Change-Id: Ic339efbd8da10256d0f0f231f5cfb35b652c1670
diff --git a/CORE/HDD/src/wlan_hdd_ftm.c b/CORE/HDD/src/wlan_hdd_ftm.c
index 4736999..18a7691 100644
--- a/CORE/HDD/src/wlan_hdd_ftm.c
+++ b/CORE/HDD/src/wlan_hdd_ftm.c
@@ -993,7 +993,7 @@
         return VOS_STATUS_E_FAILURE;
     }
 
-    if (rfGain > 31 || rfGain <0) {
+    if (rfGain > 31) {
         VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_FATAL,
                    "%s:rf gain value is invalid", __func__);
         return VOS_STATUS_E_FAILURE;