libkvm code janitoring

- make WARNS=6 clean for archs w/o strict alignment requirments
- add const, ANSIfy, remove unused vars, cast types for comparison
- thanks to differing definitions of VM_MIN_ADDRESS across our archs, we
  need to trick the compiler to not complain about signedness. We could
  either fix VM_MIN_ADDRESS to always be a simple integer or make the
  check conditional on $ARCH.

Closes PRs:	kern/42386, kern/83364
Reviewed by:	bde

1 files changed, 3 insertions, 4 deletions

diff --git a/lib/libkvm/kvm_mips.c b/lib/libkvm/kvm_mips.c
index d311b9e..ad0834b 100644
--- a/lib/libkvm/kvm_mips.c
+++ b/lib/libkvm/kvm_mips.c
@@ -94,12 +94,9 @@ _kvm_initvtop(kvm_t *kd)
 }
 
 int
-_kvm_kvatop(kvm_t *kd, u_long va , off_t *pa)
+_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
 {
 
-	u_long offset = va & (PAGE_SIZE - 1);
-	struct vmstate *vm = kd->vmst;
-
 	if (kd->vmst->minidump)
 		return _kvm_minidump_kvatop(kd, va, pa);
 
@@ -113,9 +110,11 @@ _kvm_kvatop(kvm_t *kd, u_long va , off_t *pa)
  * not just those for a kernel crash dump.  Some architectures
  * have to deal with these NOT being constants!  (i.e. m68k)
  */
+#ifdef FBSD_NOT_YET
 int
 _kvm_mdopen(kvm_t *kd __unused)
 {
 
 	return (0);
 }
+#endif