efi_selftest: efi_st_memcmp return difference of bytes

If the memory regions are different efi_st_memcmp currently
returns the difference of the addresses. Insted the
difference of the first differing byte pair should be
returned.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/lib/efi_selftest/efi_selftest_util.c b/lib/efi_selftest/efi_selftest_util.c
index c9c295e2fbebed158d7a9ad4e857b8d7baf9db3c..5cffe383d8d317190581c09ae73390895ee1da2e 100644 (file)
--- a/lib/efi_selftest/efi_selftest_util.c
+++ b/lib/efi_selftest/efi_selftest_util.c
@@ -17,7 +17,7 @@ int efi_st_memcmp(const void *buf1, const void *buf2, size_t length)
 
        for (; length; --length) {
                if (*pos1 != *pos2)
-                       return pos1 - pos2;
+                       return *pos1 - *pos2;
                ++pos1;
                ++pos2;
        }