fix some memleaks in tests

These tests has forgott to call uc_close(uc), which lead to memory
leaks. Found by the LeakSanitizer.

Author: PhilippTakacs

tests/unit/test_arm.c

@@ -905,6 +905,7 @@ static void test_arm_tcg_opcode_cmp(void)
     TEST_CHECK(cmp_info.v0 == 5 && cmp_info.v1 == 3);
     TEST_CHECK(cmp_info.pc == 0x1008);
     TEST_CHECK(cmp_info.size == 32);
+    OK(uc_close(uc));
 }
 
 static void test_arm_thumb_tcg_opcode_cmn(void)
@@ -931,6 +932,7 @@ static void test_arm_thumb_tcg_opcode_cmn(void)
     TEST_CHECK(cmp_info.v0 == 5 && cmp_info.v1 == 3);
     TEST_CHECK(cmp_info.pc == 0x1006);
     TEST_CHECK(cmp_info.size == 32);
+    OK(uc_close(uc));
 }
 
 static void test_arm_cp15_c1_c0_2(void)

tests/unit/test_arm64.c

@@ -481,6 +481,7 @@ static void test_arm64_mmu(void)
     TEST_CHECK(x1 == 0x4444444444444444);
     TEST_CHECK(x2 == 0x4444444444444444);
     free(data);
+    OK(uc_close(uc));
 }
 
 static void test_arm64_pc_wrap(void)

tests/unit/test_riscv.c

@@ -718,6 +718,7 @@ static void test_riscv_mmu(void)
     OK(uc_mem_read(uc, data_address, &data_result, sizeof(data_result)));
 
     TEST_CHECK(data_value == data_result);
+    OK(uc_close(uc));
 }
 
 static void test_riscv_priv(void)

tests/unit/test_x86.c

@@ -1589,6 +1589,8 @@ static void test_x86_mmu(void)
     OK(uc_mem_read(uc, 0x2000, &child, sizeof(child)));
     TEST_CHECK(parrent == 60);
     TEST_CHECK(child == 42);
+    OK(uc_context_free(context));
+    OK(uc_close(uc));
 }
 
 static bool test_x86_vtlb_callback(uc_engine *uc, uint64_t addr,
@@ -1632,6 +1634,7 @@ static void test_x86_segmentation(void)
     OK(uc_open(UC_ARCH_X86, UC_MODE_64, &uc));
     OK(uc_reg_write(uc, UC_X86_REG_GDTR, &gdtr));
     uc_assert_err(UC_ERR_EXCEPTION, uc_reg_write(uc, UC_X86_REG_FS, &fs));
+    OK(uc_close(uc));
 }
 
 static void test_x86_0xff_lcall_callback(uc_engine *uc, uint64_t address,