drm/exec: use unique instead of local label

GCC forbids to jump to labels in loop conditions and a new clang
check stumbled over this.

So instead using a local label inside the loop condition use an
unique label outside of it.

Fixes: 0959321 ("drm: execution context for GEM buffers v7")
Link: https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html
Link: ClangBuiltLinux#1890
Link: llvm/llvm-project@2021910
Reported-by: Nathan Chancellor <nathan@kernel.org>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
CC: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230731123625.3766-1-christian.koenig@amd.com

Author: ChristianKoenigAMD

include/drm/drm_exec.h

@@ -3,6 +3,7 @@
 #ifndef __DRM_EXEC_H__
 #define __DRM_EXEC_H__
 
+#include <linux/compiler.h>
 #include <linux/ww_mutex.h>
 
 #define DRM_EXEC_INTERRUPTIBLE_WAIT	BIT(0)
@@ -74,13 +75,12 @@ struct drm_exec {
  * Since labels can't be defined local to the loops body we use a jump pointer
  * to make sure that the retry is only used from within the loops body.
  */
-#define drm_exec_until_all_locked(exec)				\
-	for (void *__drm_exec_retry_ptr; ({			\
-		__label__ __drm_exec_retry;			\
-__drm_exec_retry:						\
-		__drm_exec_retry_ptr = &&__drm_exec_retry;	\
-		(void)__drm_exec_retry_ptr;			\
-		drm_exec_cleanup(exec);				\
+#define drm_exec_until_all_locked(exec)					\
+__PASTE(__drm_exec_, __LINE__):						\
+	for (void *__drm_exec_retry_ptr; ({				\
+		__drm_exec_retry_ptr = &&__PASTE(__drm_exec_, __LINE__);\
+		(void)__drm_exec_retry_ptr;				\
+		drm_exec_cleanup(exec);					\
 	});)
 
 /**