test: Rename sed dirname test to basename.

check.sh

@@ -146,7 +146,7 @@ tests='
 100-sed-fooRbar
 100-sed-pattern-address
 100-sed-quit
-100-sed-autoconf-dirname
+100-sed-autoconf-basename
 
 100-tar
 100-tar-Z

test/100-sed-autoconf-basename.sh

@@ -1,4 +1,4 @@
-dirname='/^.*\/\([^/][^/]*\)\/*$/{
+basename='/^.*\/\([^/][^/]*\)\/*$/{
 	    s//\1/
 	    q
 	  }
@@ -12,4 +12,4 @@ dirname='/^.*\/\([^/][^/]*\)\/*$/{
   }
   s/.*/./; q'
 
-echo 'X/foo/bar' | \sed "$dirname"
+echo 'X/foo/bar' | \sed "$basename"