lib/string/strcmp/: streq(): Simplify implementation

A one-liner macro is simpler, and works just fine.

We don't need the function at all, since we don't use it as a callback.
The macro changes the return type, but we don't really care about that
detail; we could cast it to bool, but we don't really need that, so keep
it simple.

Signed-off-by: Alejandro Colomar <[email protected]>

Author: alejandro-colomar

lib/string/strcmp/streq.c

@@ -1,12 +1,7 @@
-// SPDX-FileCopyrightText: 2024, Alejandro Colomar <[email protected]>
+// SPDX-FileCopyrightText: 2024-2026, Alejandro Colomar <[email protected]>
 // SPDX-License-Identifier: BSD-3-Clause
 
 
 #include "config.h"
 
-#include <stdbool.h>
-
 #include "string/strcmp/streq.h"
-
-
-extern inline bool streq(const char *s1, const char *s2);

lib/string/strcmp/streq.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2024, Alejandro Colomar <[email protected]>
+// SPDX-FileCopyrightText: 2024-2026, Alejandro Colomar <[email protected]>
 // SPDX-License-Identifier: BSD-3-Clause
 
 
@@ -8,24 +8,11 @@
 
 #include "config.h"
 
-#include <stdbool.h>
 #include <string.h>
 
-#include "attr.h"
 
-
-ATTR_STRING(1)
-ATTR_STRING(2)
-inline bool streq(const char *s1, const char *s2);
-
-
-// strings equal
-/* Return true if s1 and s2 compare equal.  */
-inline bool
-streq(const char *s1, const char *s2)
-{
-	return strcmp(s1, s2) == 0;
-}
+// streq - strings equal
+#define streq(s1, s2)  (!strcmp(s1, s2))
 
 
 #endif  // include guard