lisp/*.el: Fix some warnings

* lisp/battery.el (dbus-get-property):
* lisp/dired-aux.el (format-spec): Declare function.

* lisp/net/zeroconf.el (zeroconf-list-service-names)
(zeroconf-list-service-types, zeroconf-list-services):
Mark unused lexical arg.

* lisp/progmodes/hideshow.el (hs-hide-block-at-point):
* lisp/progmodes/sql.el (sql-end-of-statement):
Pass LIMIT to 'looking-back'.

lisp/battery.el

@@ -542,6 +542,9 @@ The following %-sequences are provided:
                     (t "N/A"))))))
 
 
+(declare-function dbus-get-property "dbus.el"
+                  (bus service path interface property))
+
 ;;; `upowerd' interface.
 (defsubst battery-upower-prop (pname &optional device)
   (dbus-get-property

lisp/dired-aux.el

@@ -987,6 +987,8 @@ corresponding command.
 Within CMD, %i denotes the input file(s), and %o denotes the
 output file. %i path(s) are relative, while %o is absolute.")
 
+(declare-function format-spec "format-spec.el" (format specification))
+
 ;;;###autoload
 (defun dired-do-compress-to ()
   "Compress selected files and directories to an archive.

lisp/net/zeroconf.el

@@ -256,7 +256,7 @@ supported keys depend on the service type.")
   "Returns all discovered Avahi service names as list."
   (let (result)
     (maphash
-     (lambda (key value) (add-to-list 'result (zeroconf-service-name value)))
+     (lambda (_key value) (add-to-list 'result (zeroconf-service-name value)))
      zeroconf-services-hash)
     result))
 
@@ -264,7 +264,7 @@ supported keys depend on the service type.")
   "Returns all discovered Avahi service types as list."
   (let (result)
     (maphash
-     (lambda (key value) (add-to-list 'result (zeroconf-service-type value)))
+     (lambda (_key value) (add-to-list 'result (zeroconf-service-type value)))
      zeroconf-services-hash)
     result))
 
@@ -276,7 +276,7 @@ The service type is one of the returned values of
 format of SERVICE."
   (let (result)
     (maphash
-     (lambda (key value)
+     (lambda (_key value)
        (when (equal type (zeroconf-service-type value))
 	 (add-to-list 'result value)))
      zeroconf-services-hash)

lisp/progmodes/hideshow.el

@@ -582,7 +582,7 @@ and then further adjusted to be at the end of the line."
 	  (setq p (line-end-position)))
 	;; `q' is the point at the end of the block
 	(hs-forward-sexp mdata 1)
-	(setq q (if (looking-back hs-block-end-regexp)
+	(setq q (if (looking-back hs-block-end-regexp nil)
 		    (match-beginning 0)
 		  (point)))
         (when (and (< p q) (> (count-lines p q) 1))

lisp/progmodes/sql.el

@@ -2790,7 +2790,7 @@ local variable."
     ;; Iterate until we've moved the desired number of stmt ends
     (while (not (= (cl-signum arg) 0))
       ;; if we're looking at the terminator, jump by 2
-      (if (or (and (> 0 arg) (looking-back term))
+      (if (or (and (> 0 arg) (looking-back term nil))
               (and (< 0 arg) (looking-at term)))
           (setq n 2)
         (setq n 1))