refactor(known_hosts_real): use _comp_split for known_hosts filenames

Author: akinomyoga

bash_completion

@@ -2415,7 +2415,7 @@ _known_hosts_real()
         #          spaces in their name work (watch out for ~ expansion
         #          breakage! Alioth#311595)
         if _comp_split -l tmpkh "$(awk 'sub("^[ \t]*([Gg][Ll][Oo][Bb][Aa][Ll]|[Uu][Ss][Ee][Rr])[Kk][Nn][Oo][Ww][Nn][Hh][Oo][Ss][Tt][Ss][Ff][Ii][Ll][Ee][ \t=]+", "") { print $0 }' "${config[@]}" | sort -u)"; then
-            local j
+            local tmpkh2 j
             for i in "${tmpkh[@]}"; do
                 # First deal with quoted entries...
                 while [[ $i =~ ^([^\"]*)\"([^\"]*)\"(.*)$ ]]; do
@@ -2425,7 +2425,8 @@ _known_hosts_real()
                     [[ -r $j ]] && kh+=("$j")
                 done
                 # ...and then the rest.
-                for j in $i; do
+                _comp_split tmpkh2 "$i" || continue
+                for j in "${tmpkh2[@]}"; do
                     __expand_tilde_by_ref j # Eval/expand possible `~' or `~user'
                     [[ -r $j ]] && kh+=("$j")
                 done