b43: silence most sparse warnings

  CHECK   drivers/net/wireless/b43/main.c
drivers/net/wireless/b43/main.c:111:5: warning: symbol 'b43_modparam_pio' was not declared. Should it be static?
  CHECK   drivers/net/wireless/b43/phy_g.c
drivers/net/wireless/b43/phy_g.c:975:56: warning: cast truncates bits from constant value (ffff7fff becomes 7fff)
  CHECK   drivers/net/wireless/b43/phy_lp.c
drivers/net/wireless/b43/phy_lp.c:2701:6: warning: symbol 'b43_lpphy_op_switch_analog' was not declared. Should it be static?
drivers/net/wireless/b43/phy_lp.c:1148:30: warning: cast truncates bits from constant value (ffff1fff becomes 1fff)
drivers/net/wireless/b43/phy_lp.c:1525:30: warning: cast truncates bits from constant value (ffff1fff becomes 1fff)
drivers/net/wireless/b43/phy_lp.c:1529:30: warning: cast truncates bits from constant value (ffff1fff becomes 1fff)
  CHECK   drivers/net/wireless/b43/wa.c
drivers/net/wireless/b43/wa.c:385:60: warning: cast truncates bits from constant value (ffff00ff becomes ff)
drivers/net/wireless/b43/wa.c:403:55: warning: cast truncates bits from constant value (ffff00ff becomes ff)
drivers/net/wireless/b43/wa.c:405:55: warning: cast truncates bits from constant value (ffff00ff becomes ff)
drivers/net/wireless/b43/wa.c:415:71: warning: cast truncates bits from constant value (ffff0fff becomes fff)

AFAICT, none of these amount to real bugs.  But this reduces warning
spam from sparse w/o significantly affecting readability of the code (IMHO).

Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/b43/wa.c b/drivers/net/wireless/b43/wa.c
index 97c7916..9a335da 100644
--- a/drivers/net/wireless/b43/wa.c
+++ b/drivers/net/wireless/b43/wa.c
@@ -382,7 +382,7 @@
 		b43_ofdmtab_write16(dev, B43_OFDMTAB_AGC1, 3, 25);
 	}
 
-	b43_phy_maskset(dev, B43_PHY_CCKSHIFTBITS_WA, (u16)~0xFF00, 0x5700);
+	b43_phy_maskset(dev, B43_PHY_CCKSHIFTBITS_WA, 0x00FF, 0x5700);
 	b43_phy_maskset(dev, B43_PHY_OFDM(0x1A), ~0x007F, 0x000F);
 	b43_phy_maskset(dev, B43_PHY_OFDM(0x1A), ~0x3F80, 0x2B80);
 	b43_phy_maskset(dev, B43_PHY_ANTWRSETT, 0xF0FF, 0x0300);
@@ -400,9 +400,9 @@
 	b43_phy_maskset(dev, B43_PHY_OFDM(0x89), ~0x00FF, 0x0020);
 	b43_phy_maskset(dev, B43_PHY_OFDM(0x89), ~0x3F00, 0x0200);
 	b43_phy_maskset(dev, B43_PHY_OFDM(0x82), ~0x00FF, 0x002E);
-	b43_phy_maskset(dev, B43_PHY_OFDM(0x96), (u16)~0xFF00, 0x1A00);
+	b43_phy_maskset(dev, B43_PHY_OFDM(0x96), 0x00FF, 0x1A00);
 	b43_phy_maskset(dev, B43_PHY_OFDM(0x81), ~0x00FF, 0x0028);
-	b43_phy_maskset(dev, B43_PHY_OFDM(0x81), (u16)~0xFF00, 0x2C00);
+	b43_phy_maskset(dev, B43_PHY_OFDM(0x81), 0x00FF, 0x2C00);
 	if (phy->rev == 1) {
 		b43_phy_write(dev, B43_PHY_PEAK_COUNT, 0x092B);
 		b43_phy_maskset(dev, B43_PHY_OFDM(0x1B), ~0x001E, 0x0002);
@@ -412,7 +412,7 @@
 		b43_phy_maskset(dev, B43_PHY_LPFGAINCTL, ~0x000F, 0x0004);
 		if (phy->rev >= 6) {
 			b43_phy_write(dev, B43_PHY_OFDM(0x22), 0x287A);
-			b43_phy_maskset(dev, B43_PHY_LPFGAINCTL, (u16)~0xF000, 0x3000);
+			b43_phy_maskset(dev, B43_PHY_LPFGAINCTL, 0x0FFF, 0x3000);
 		}
 	}
 	b43_phy_maskset(dev, B43_PHY_DIVSRCHIDX, 0x8080, 0x7874);