Fix busted .gitignore entry.

Typo in commit 2258e76.

Author: tglsfdc

src/bin/pg_waldump/.gitignore

@@ -22,8 +22,10 @@
 /tblspcdesc.c
 /xactdesc.c
 /xlogdesc.c
+
+# Source files copied from src/backend/access/transam/
 /xlogreader.c
-/xlogstat.c
+/xlogstats.c
 
 # Generated by test suite
 /tmp_check/