ppc: init_32: Fix error typo "CONFIG_START_KERNEL"

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

arch/powerpc/mm/init_32.c

@@ -52,7 +52,7 @@
 #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
 /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */
 #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET))
-#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL"
+#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START"
 #endif
 #endif
 #define MAX_LOW_MEM	CONFIG_LOWMEM_SIZE