make: Use <<< instead of printf + pipe

Author: scop

completions/make

@@ -6,8 +6,7 @@ function _make_target_extract_script()
     shift
 
     local prefix="$1"
-    local prefix_pat=$( printf "%s\n" "$prefix" | \
-                        command sed 's/[][\,.*^$(){}?+|/]/\\&/g' )
+    local prefix_pat=$( command sed 's/[][\,.*^$(){}?+|/]/\\&/g' <<<"$prefix" )
     local basename=${prefix##*/}
     local dirname_len=$(( ${#prefix} - ${#basename} ))