standard: Use return true / return false for functions returning bool

Changes done with Coccinelle:

    @r1@
    identifier fn;
    typedef bool;
    symbol false;
    symbol true;
    @@

    bool fn ( ... )
    {
    <...
    return
    (
    - 0
    + false
    |
    - 1
    + true
    )
    ;
    ...>
    }

Coccinelle patch sourced from
torvalds/linux@46b5c9b856.

ext/standard/http_fopen_wrapper.c

@@ -111,11 +111,11 @@ static bool check_has_header(const char *headers, const char *header) {
 	const char *s = headers;
 	while ((s = strstr(s, header))) {
 		if (s == headers || (*(s-1) == '\n' && *(s-2) == '\r')) {
-			return 1;
+			return true;
 		}
 		s++;
 	}
-	return 0;
+	return false;
 }
 
 static zend_result php_stream_handle_proxy_authorization_header(const char *s, smart_str *header)

ext/standard/password.c

@@ -140,7 +140,7 @@ static bool php_password_bcrypt_needs_rehash(const zend_string *hash, zend_array
 
 	if (!php_password_bcrypt_valid(hash)) {
 		/* Should never get called this way. */
-		return 1;
+		return true;
 	}
 
 	sscanf(ZSTR_VAL(hash), "$2y$" ZEND_LONG_FMT "$", &old_cost);
@@ -156,12 +156,12 @@ static bool php_password_bcrypt_verify(const zend_string *password, const zend_s
 	zend_string *ret = php_crypt(ZSTR_VAL(password), (int)ZSTR_LEN(password), ZSTR_VAL(hash), (int)ZSTR_LEN(hash), 1);
 
 	if (!ret) {
-		return 0;
+		return false;
 	}
 
 	if (ZSTR_LEN(hash) < 13) {
 		zend_string_free(ret);
-		return 0;
+		return false;
 	}
 
 	/* We're using this method instead of == in order to provide

ext/standard/string.c

@@ -1348,15 +1348,15 @@ static bool _is_basename_start(const char *start, const char *pos)
 	    && *(pos-1) != '/'
 	    && *(pos-1) != '\\') {
 		if (pos - start == 1) {
-			return 1;
+			return true;
 		} else if (*(pos-2) == '/' || *(pos-2) == '\\') {
-			return 1;
+			return true;
 		} else if (*(pos-2) == ':'
 			&& _is_basename_start(start, pos - 2)) {
-			return 1;
+			return true;
 		}
 	}
-	return 0;
+	return false;
 }
 #endif
 
@@ -5040,7 +5040,7 @@ static bool php_tag_find(char *tag, size_t len, const char *set) {
 	char *norm;
 
 	if (len == 0) {
-		return 0;
+		return false;
 	}
 
 	norm = emalloc(len+1);