lib/lzo: add unlikely hints to overrun checks

The NEED_* macros do an implicit goto in case the safety bounds checks
fail. Add the unlikely hints as this is the error case and not a hot
path. The final assembly is slightly shorter and some jumps got
reordered according to the hints.

text data bss dec hex filename
2294 16 0 2310 906 pre/lzo1x_decompress_safe.o
2277 16 0 2293 8f5 post/lzo1x_decompress_safe.o

text data bss dec hex filename
3444 48 0 3492 da4 pre/lzo1x_compress_safe.o
3372 48 0 3420 d5c post/lzo1x_compress_safe.o

Signed-off-by: David Sterba <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

lib/lzo/lzo1x_compress.c

···
 #define HAVE_OP(x) 1
 #endif
 
-#define NEED_OP(x) if (!HAVE_OP(x)) goto output_overrun
+#define NEED_OP(x) if (unlikely(!HAVE_OP(x))) goto output_overrun
 
 static noinline int
 LZO_SAFE(lzo1x_1_do_compress)(const unsigned char *in, size_t in_len,

lib/lzo/lzo1x_decompress_safe.c

···
 
 #define HAVE_IP(x)      ((size_t)(ip_end - ip) >= (size_t)(x))
 #define HAVE_OP(x)      ((size_t)(op_end - op) >= (size_t)(x))
-#define NEED_IP(x)      if (!HAVE_IP(x)) goto input_overrun
-#define NEED_OP(x)      if (!HAVE_OP(x)) goto output_overrun
-#define TEST_LB(m_pos)  if ((m_pos) < out) goto lookbehind_overrun
+#define NEED_IP(x)      if (unlikely(!HAVE_IP(x))) goto input_overrun
+#define NEED_OP(x)      if (unlikely(!HAVE_OP(x))) goto output_overrun
+#define TEST_LB(m_pos)  if (unlikely((m_pos) < out)) goto lookbehind_overrun
 
 /* This MAX_255_COUNT is the maximum number of times we can add 255 to a base
  * count without overflowing an integer. The multiply will overflow when