net: filter: Fix some minor issues in sparc JIT.

Correct conventions comments.  %o4 and %o5 were swapped,
%g3 was not documented.

Use r_TMP instead of r_SKB_DATA + r_OFF where possible in
assembler stubs.

Correct discussion of %o4 and %o5 in one of bpf_jit_compile()'s
comments.

Based upon feedback from Richard Mortimer.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/net/bpf_jit_comp.c b/arch/sparc/net/bpf_jit_comp.c
index 86349ca..ebc8980 100644
--- a/arch/sparc/net/bpf_jit_comp.c
+++ b/arch/sparc/net/bpf_jit_comp.c
@@ -378,7 +378,7 @@
 				emit_clear(r_X);
 
 			/* If this filter needs to access skb data,
-			 * load %o4 and %o4 with:
+			 * load %o4 and %o5 with:
 			 *  %o4 = skb->len - skb->data_len
 			 *  %o5 = skb->data
 			 * And also back up %o7 into r_saved_O7 so we can