staging: rtl8192e: adjust size of rx_pwr for new RF90_PATH_MAX

The local array rx_pwr in the function _rtl92e_query_rxphystatus() is
always accessed by indices in the range i = 0; i < RF90_PATH_MAX.
A previous patch changed the value of RF90_PATH_MAX from 4 to 2, so we can
reduce the size of rx_pwr to 2. Use RF90_PATH_MAX instead of a hard-coded
size.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/20240831100809.29173-3-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c

@@ -1159,7 +1159,7 @@ static void _rtl92e_query_rxphystatus(struct r8192_priv *priv,
 	struct phy_sts_cck_819xpci *pcck_buf;
 	u8 *prxpkt;
 	u8 i, max_spatial_stream, tmp_rxevm;
-	s8 rx_pwr[4], rx_pwr_all = 0;
+	s8 rx_pwr[RF90_PATH_MAX], rx_pwr_all = 0;
 	s8 rx_evmX;
 	u8 evm, pwdb_all;
 	u32 RSSI, total_rssi = 0;