handle pids without files correctly.

src/cmd/acid/main.c

diff --git a/src/cmd/acid/main.c b/src/cmd/acid/main.c
index dccff26..559839f 100644
--- a/src/cmd/acid/main.c
+++ b/src/cmd/acid/main.c
@@ -213,7 +213,7 @@
 		}
 		/* XXX pull command from core */
 
-		if((hdr = crackhdr(symfil, omode)) == nil){
+		if((symhdr = crackhdr(symfil, omode)) == nil){
 			fprint(2, "crackhdr %s: %r\n", symfil);
 			symfil = nil;
 		}