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_mpi.function b/tests/suites/test_suite_mpi.function
index a3afb9b..895a087 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -373,7 +373,8 @@
     if( result == 0)
     {
 
-        TEST_ASSERT( mbedtls_test_hexcmp( buf, input_A->x, buflen, input_A->len ) == 0 );
+        TEST_ASSERT( mbedtls_test_hexcmp( buf, input_A->x,
+                                          buflen, input_A->len ) == 0 );
     }
 
 exit:
@@ -404,7 +405,8 @@
     if( result == 0)
     {
 
-        TEST_ASSERT( mbedtls_test_hexcmp( buf, input_A->x, buflen, input_A->len ) == 0 );
+        TEST_ASSERT( mbedtls_test_hexcmp( buf, input_A->x,
+                                          buflen, input_A->len ) == 0 );
     }
 
 exit:
@@ -438,7 +440,8 @@
         TEST_ASSERT( mbedtls_mpi_write_binary( &X, buf, buflen ) == 0 );
 
 
-        TEST_ASSERT( mbedtls_test_hexcmp( buf, input_A->x, buflen, input_A->len ) == 0 );
+        TEST_ASSERT( mbedtls_test_hexcmp( buf, input_A->x,
+                                          buflen, input_A->len ) == 0 );
     }
 
 exit: