staging: rtl8192e: Fix compilation warnings

When the driver is compiled, the following messages result:

  CC [M]  drivers/staging/rtl8192e/r8192E_phy.o
drivers/staging/rtl8192e/r8192E_phy.c: In function ‘rtl8192_phy_ConfigRFWithHeaderFile’:
drivers/staging/rtl8192e/r8192E_phy.c:791:25: warning: array subscript is above array bounds
drivers/staging/rtl8192e/r8192E_phy.c:780:25: warning: array subscript is above array bounds

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>