Add missing exit labels to MPS tests

Coverity flagged this due to the potential leaked memory allocations in
mbedtls_mps_reader_random_usage()

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/tests/suites/test_suite_mps.function b/tests/suites/test_suite_mps.function
index 0b8434b..6751136 100644
--- a/tests/suites/test_suite_mps.function
+++ b/tests/suites/test_suite_mps.function
@@ -65,6 +65,8 @@
     /* Wrapup (lower layer) */
     TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, &paused) == 0);
     TEST_ASSERT(paused == 0);
+
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -119,6 +121,8 @@
     TEST_ASSERT(mbedtls_mps_reader_commit(&rd) == 0);
     /* Wrapup (lower layer) */
     TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, NULL) == 0);
+
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -170,6 +174,8 @@
     TEST_ASSERT(mbedtls_mps_reader_commit(&rd) == 0);
     /* Wrapup (lower layer) */
     TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, NULL) == 0);
+
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -217,6 +223,8 @@
     TEST_ASSERT(mbedtls_mps_reader_commit(&rd) == 0);
     /* Wrapup */
     TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, NULL) == 0);
+
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -250,6 +258,8 @@
     /* Wrapup (lower layer) */
     TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, NULL) ==
                 MBEDTLS_ERR_MPS_READER_NEED_ACCUMULATOR);
+
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -297,6 +307,7 @@
     TEST_ASSERT(mbedtls_mps_reader_get(&rd, 50, &tmp, &tmp_len) == 0);
     TEST_MEMORY_COMPARE(tmp, tmp_len, buf + 50, 50);
 
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -333,6 +344,7 @@
     TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, NULL) ==
                 MBEDTLS_ERR_MPS_READER_ACCUMULATOR_TOO_SMALL);
 
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -458,6 +470,8 @@
 
     /* Wrapup */
     TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, NULL) == 0);
+
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -562,6 +576,8 @@
 
     /* Wrapup */
     TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, NULL) == 0);
+
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -623,6 +639,8 @@
     /* Wrapup */
     TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, NULL) ==
                 MBEDTLS_ERR_MPS_READER_DATA_LEFT);
+
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -795,6 +813,7 @@
             break;
     }
 
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */
@@ -951,6 +970,7 @@
         }
     }
 
+exit:
     /* Cleanup */
     mbedtls_mps_reader_free(&rd);
     mbedtls_free(incoming);
@@ -1103,6 +1123,7 @@
         TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, NULL) == 0);
     }
 
+exit:
     /* Wrapup */
     mbedtls_mps_reader_free(&rd);
 }
@@ -1136,6 +1157,8 @@
 
     /* Wrapup */
     TEST_ASSERT(mbedtls_mps_reader_reclaim(&rd, NULL) == 0);
+
+exit:
     mbedtls_mps_reader_free(&rd);
 }
 /* END_CASE */