Staging: rtl8192e: Rename variable GreenField

Rename variable GreenField to green_field
to fix checkpatch warning Avoid CamelCase.

Signed-off-by: Tree Davies <tdavies@darkphysics.net>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/20240428230106.6548-11-tdavies@darkphysics.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: treedavies

drivers/staging/rtl8192e/rtl819x_HT.h

@@ -27,7 +27,7 @@ struct ht_capab_ele {
 	u8	adv_coding:1;
 	u8	chl_width:1;
 	u8	mimo_pwr_save:2;
-	u8	GreenField:1;
+	u8	green_field:1;
 	u8	short_gi_20mhz:1;
 	u8	short_gi_40mhz:1;
 	u8	TxSTBC:1;

drivers/staging/rtl8192e/rtl819x_HTProc.c

@@ -258,7 +258,7 @@ void ht_construct_capability_element(struct rtllib_device *ieee, u8 *pos_ht_cap,
 		cap_ele->chl_width = 1;
 
 	cap_ele->mimo_pwr_save		= 3;
-	cap_ele->GreenField		= 0;
+	cap_ele->green_field		= 0;
 	cap_ele->short_gi_20mhz		= 1;
 	cap_ele->short_gi_40mhz		= 1;