qcacld-3.0: Initialize variable to prevent potential information leak

In the function drv_cmd_set_mc_rate, the variable targetRate, used to
store the value parsed from the command from user space, is not
initialized. The variable is assigned value inside a kernel API
kstrtouint that converts the string to an unsigned int. In a certain
case if the kernel API fails, it returns an error code without assigning
any value to the passed parameter. In this scenario, the variable
targetRate, still uninitialized is passed on to function
wlan_hdd_set_mc_rate where it is logged using hdd_debug. As the flow
goes on, it is then again logged using WMA_LOGE(). This might lead to
potential information leak.

Initialize the variable to zero to prevent the mentioned scenario.

Change-Id: Ideec0b1930e994f19ae8a669cd2963db4016eae1
CRs-Fixed: 2226172

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