[WCNCR00145893] misc: Fix debug CMD for CCK SP case

[Description]
Fix debug CMD for CCK SP case

Change-Id: I012c3a3c52915942d91f62448c6f92b372541d40
Signed-off-by: Yi-Cheng Huang <yi-cheng.huang@mediatek.com>
CR-Id: WCNCR00145893
Feature: misc
diff --git a/os/linux/gl_wext_priv.c b/os/linux/gl_wext_priv.c
index e1f64c9..14aa6d7 100644
--- a/os/linux/gl_wext_priv.c
+++ b/os/linux/gl_wext_priv.c
@@ -3827,7 +3827,7 @@
 
 		if (txmode == TX_RATE_MODE_CCK)
 			i4BytesWritten += kalSnprintf(pcCommand + i4BytesWritten, i4TotalLen - i4BytesWritten,
-				"%s, ", rate < 4 ? HW_TX_RATE_CCK_STR[rate] : HW_TX_RATE_CCK_STR[4]);
+				"%s, ", HW_TX_RATE_CCK_STR[rate & 0x3]);
 		else if (txmode == TX_RATE_MODE_OFDM)
 			i4BytesWritten += kalSnprintf(pcCommand + i4BytesWritten, i4TotalLen - i4BytesWritten,
 				"%s, ", hw_rate_ofdm_str(rate));