runtime: fix "SysReserve returned unaligned address" bug on 32-bit systems

R=rsc
CC=golang-dev
https://golang.org/cl/5642064

diff --git a/src/pkg/runtime/malloc.goc b/src/pkg/runtime/malloc.goc
index 4e6bbe1b0fe624229fc2eb4dc483ae5c06ddebb0..885ab0395a6caff3f1e3291cbf69905b3bc4aeff 100644 (file)
--- a/src/pkg/runtime/malloc.goc
+++ b/src/pkg/runtime/malloc.goc
@@ -261,6 +261,8 @@ runtime·mallocinit(void)
        extern byte end[];
        byte *want;
 
+       p = nil;
+
        runtime·InitSizes();
 
        // Set up the allocation arena, a contiguous area of memory where