Softap: Avoid possible array index out-of-bounds access.

Return value of snprintf can be more than size value when output
is truncated, so copying the '\0' at return value may cause array
index out-of-bound access. And as snprintf function takes care of
terminating the string with '\0', its redundant to copy '\0' at
return value.

CRs-Fixed: 947966
Change-Id: Ic5dab6d9aa57db5000f23c82e2a22924e0154c40

softap/sdk/qsap_api.c

@@ -703,7 +703,6 @@ end:
 static s8 *qsap_get_allow_deny_file_name(s8 *pcfgfile, struct Command * pcmd, s8 *pfile, u32 *plen)
 {
     if(eSUCCESS == qsap_read_cfg(pcfgfile, pcmd, pfile, plen, NULL, GET_ENABLED_ONLY)) {
-        pfile[*plen] = '\0';
         return strchr(pfile, '=') + 1;
     }