rt2x00: make csr_cache and csr_addr an union

The csr_cache and csr_addr pointers are both the same size
and they are never used both by the same driver. This makes
them a nice candidate for an union.
We could merge into 1 pointer, but that would either upset sparse,
or require a lot of __force casts.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2x00pci.h b/drivers/net/wireless/rt2x00/rt2x00pci.h
index 71335e1..8932b31 100644
--- a/drivers/net/wireless/rt2x00/rt2x00pci.h
+++ b/drivers/net/wireless/rt2x00/rt2x00pci.h
@@ -61,7 +61,7 @@
 					   const unsigned long offset,
 					   u32 *value)
 {
-	*value = readl(rt2x00dev->csr_addr + offset);
+	*value = readl(rt2x00dev->csr.base + offset);
 }
 
 static inline void
@@ -69,14 +69,14 @@
 			     const unsigned long offset,
 			     void *value, const u16 length)
 {
-	memcpy_fromio(value, rt2x00dev->csr_addr + offset, length);
+	memcpy_fromio(value, rt2x00dev->csr.base + offset, length);
 }
 
 static inline void rt2x00pci_register_write(struct rt2x00_dev *rt2x00dev,
 					    const unsigned long offset,
 					    u32 value)
 {
-	writel(value, rt2x00dev->csr_addr + offset);
+	writel(value, rt2x00dev->csr.base + offset);
 }
 
 static inline void
@@ -84,7 +84,7 @@
 			      const unsigned long offset,
 			      void *value, const u16 length)
 {
-	memcpy_toio(rt2x00dev->csr_addr + offset, value, length);
+	memcpy_toio(rt2x00dev->csr.base + offset, value, length);
 }
 
 /*