tests: Reformating due to hexcmp() renaming

Command to find the files in which lines have gone
larger than 79 characters due to the renaming:

grep '.\{80\}' \
`git diff-tree --no-commit-id --name-only -r HEAD` \
| grep hexcmp

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tests/suites/test_suite_arc4.function b/tests/suites/test_suite_arc4.function
index 7f85df6..9aa4913 100644
--- a/tests/suites/test_suite_arc4.function
+++ b/tests/suites/test_suite_arc4.function
@@ -21,7 +21,9 @@
     mbedtls_arc4_setup(&ctx, key_str->x, key_str->len);
     TEST_ASSERT( mbedtls_arc4_crypt(&ctx, src_str->len, src_str->x, dst_str ) == 0 );
 
-    TEST_ASSERT( mbedtls_test_hexcmp( dst_str, hex_dst_string->x, src_str->len, hex_dst_string->len ) == 0 );
+    TEST_ASSERT( mbedtls_test_hexcmp( dst_str, hex_dst_string->x,
+                                      src_str->len,
+                                      hex_dst_string->len ) == 0 );
 
 exit:
     mbedtls_arc4_free( &ctx );