scripts/kallsyms: suppress build warning

Suppress a warn_unused_result warning.

fgets is called as a part of error handling. It is called just to drop a
line and return immediately. read_map is reading the file in a loop and
read_symbol reads line by line. So I think there is no point in using
return value for useful checking. Other checks like 3 items were returned
or !EOF have already been done.

Signed-off-by: Himanshu Chauhan <[e-mail]>
Cc: WANG Cong <[e-mail]>
Cc: Michal Marek <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Michal Marek <[e-mail]>

scripts/kallsyms.c

···
 	rc = fscanf(in, "%llx %c %499s\n", &s->addr, &stype, str);
 	if (rc != 3) {
 		if (rc != EOF) {
-			/* skip line */
-			fgets(str, 500, in);
+			/* skip line. sym is used as dummy to
+			 * shut of "warn_unused_result" warning.
+			 */
+			sym = fgets(str, 500, in);
 		}
 		return -1;
 	}