powerpc32: remove ioremap_base

ioremap_base is not initialised and is nowhere used so remove it

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index db0d35e..815ccd7 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -37,7 +37,6 @@
 
 #include "mmu_decl.h"
 
-unsigned long ioremap_base;
 unsigned long ioremap_bot;
 EXPORT_SYMBOL(ioremap_bot);	/* aka VMALLOC_END */
 
@@ -173,7 +172,7 @@
 	/*
 	 * Choose an address to map it to.
 	 * Once the vmalloc system is running, we use it.
-	 * Before then, we use space going down from ioremap_base
+	 * Before then, we use space going down from IOREMAP_TOP
 	 * (ioremap_bot records where we're up to).
 	 */
 	p = addr & PAGE_MASK;