src/lib: Remove braces for single statements

Fix the following warning detected by checkpatch.pl:

WARNING: braces {} are not necessary for single statement blocks

TEST=Build and run on Galileo Gen2

Change-Id: Ie4b41f6fb75142ddd75103a55e0347ed85e7e873
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18697
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins)

src/lib/gcov-glue.c

@@ -134,9 +134,8 @@ static void coverage_init(void *unused)
 	if (ctor == NULL)
 		return;
 
-	for (; *ctor != (func_ptr) 0; ctor++) {
+	for (; *ctor != (func_ptr) 0; ctor++)
 		(*ctor)();
-	}
 }
 
 void __gcov_flush(void);