kallsyms: sync with v2 upstream patches

A couple differences:

  - A tab instead of spaces.

  - Use `sizeof()` as suggested by Kees Cook.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

scripts/kallsyms.c

@@ -33,7 +33,7 @@
 #define KSYM_NAME_LEN		512
 
 /* A substantially bigger size than the current maximum. */
-#define KSYM_NAME_LEN_BUFFER   2048
+#define KSYM_NAME_LEN_BUFFER	2048
 _Static_assert(
 	KSYM_NAME_LEN_BUFFER == KSYM_NAME_LEN * 4,
 	"Please keep KSYM_NAME_LEN_BUFFER in sync with KSYM_NAME_LEN"
@@ -215,7 +215,7 @@ static struct sym_entry *read_symbol(FILE *in)
 
 	rc = fscanf(in, "%llx %c %" _stringify(KSYM_NAME_LEN_BUFFER) "s\n", &addr, &type, name);
 	if (rc != 3) {
-		if (rc != EOF && fgets(name, KSYM_NAME_LEN_BUFFER + 1, in) == NULL)
+		if (rc != EOF && fgets(name, sizeof(name), in) == NULL)
 			fprintf(stderr, "Read error or end of file.\n");
 		return NULL;
 	}