MIPS: fw/arc: Remove unused addr variable

The addr variable in prom_free_prom_memory() has been unused since
commit 0df1007677d5 ("MIPS: fw: Record prom memory"), leading to a
compiler warning:

    warning: unused variable 'addr' [-Wunused-variable]

Fix this by removing the unused variable.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Fixes: 0df1007677d5 ("MIPS: fw: Record prom memory")
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-mips@vger.kernel.org
diff --git a/arch/mips/fw/arc/memory.c b/arch/mips/fw/arc/memory.c
index af44b35..b4328b3 100644
--- a/arch/mips/fw/arc/memory.c
+++ b/arch/mips/fw/arc/memory.c
@@ -160,7 +160,6 @@
 void __init prom_free_prom_memory(void)
-	unsigned long addr;
 	int i;
 	if (prom_flags & PROM_FLAG_DONT_FREE_TEMP)