mm/memory-failure: remove unneeded empty string

Remove unneeded empty string in definition of macro pr_fmt.  No functional
change intended.

Link: https://lkml.kernel.org/r/20240612071835.157004-6-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/memory-failure.c

@@ -2518,7 +2518,7 @@ static int __init memory_failure_init(void)
 core_initcall(memory_failure_init);
 
 #undef pr_fmt
-#define pr_fmt(fmt)	"" fmt
+#define pr_fmt(fmt)	fmt
 #define unpoison_pr_info(fmt, pfn, rs)			\
 ({							\
 	if (__ratelimit(rs))				\