efi_selftest: fix typos

fix typos
correct the header comment of efi_selftest_variables.c

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_fdt.c b/lib/efi_selftest/efi_selftest_fdt.c
index c7bc242..d545d51 100644
--- a/lib/efi_selftest/efi_selftest_fdt.c
+++ b/lib/efi_selftest/efi_selftest_fdt.c
@@ -16,7 +16,7 @@
 static struct efi_boot_services *boottime;
 static const char *fdt;
 
-/* This should be sufficent for */
+/* This should be sufficient for */
 #define BUFFERSIZE 0x100000
 
 static efi_guid_t fdt_guid = EFI_FDT_GUID;