Clean up unnecessary ternary expressions and simplify some returns

- Simplify conditions
- Use ZEND_HASH_APPLY_* instead of hard-coded booleans
- Use ZEND_NORMALIZE_BOOL
- Drop sign in favor of ZEND_NORMALIZE_BOOL

ext/imap/php_imap.c

@@ -4074,11 +4074,8 @@ int _php_imap_mail(char *to, char *subject, char *message, char *headers, char *
 		}
 		fprintf(sendmail, "\n%s\n", message);
 		ret = pclose(sendmail);
-		if (ret == -1) {
-			return 0;
-		} else {
-			return 1;
-		}
+
+		return ret != -1;
 	} else {
 		php_error_docref(NULL, E_WARNING, "Could not execute mail delivery program");
 		return 0;