Prefer string-match-p when we only need a boolean result

Author: purcell

exec-path-from-shell.el

@@ -137,7 +137,7 @@ The default value denotes an interactive login shell."
 
 (defun exec-path-from-shell--standard-shell-p (shell)
   "Return non-nil iff SHELL supports the standard ${VAR-default} syntax."
-  (not (string-match "\\(fish\\|nu\\|t?csh\\)$" shell)))
+  (not (string-match-p "\\(fish\\|nu\\|t?csh\\)$" shell)))
 
 (defmacro exec-path-from-shell--warn-duration (&rest body)
   "Evaluate BODY and warn if execution duration exceeds a time limit.