src/include: 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: I00b59f6a27c3acb393deaa763596363b7e958efd
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18654
Tested-by: build bot (Jenkins)
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/include/string.h

@@ -24,18 +24,16 @@ int snprintf(char * buf, size_t size, const char *fmt, ...);
 static inline size_t strnlen(const char *src, size_t max)
 {
 	size_t i = 0;
-	while ((*src++) && (i < max)) {
+	while ((*src++) && (i < max))
 		i++;
-	}
 	return i;
 }
 
 static inline size_t strlen(const char *src)
 {
 	size_t i = 0;
-	while (*src++) {
+	while (*src++)
 		i++;
-	}
 	return i;
 }