staging: rtlwifi: Use proper enum for return in halmac_parse_psd_data_88xx

Clang warns:

drivers/staging/rtlwifi/halmac/halmac_88xx/halmac_func_88xx.c:2472:11:
warning: implicit conversion from enumeration type 'enum
halmac_cmd_process_status' to different enumeration type 'enum
halmac_ret_status' [-Wenum-conversion]
                        return HALMAC_CMD_PROCESS_ERROR;
                        ~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.

Fix this by using the proper enum for allocation failures,
HALMAC_RET_MALLOC_FAIL, which is used in the rest of this file.

Fixes: e4b08e16b7 ("staging: r8822be: check kzalloc return or bail")
Link: https://github.com/ClangBuiltLinux/linux/issues/375
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtlwifi/halmac/halmac_88xx/halmac_func_88xx.c

@@ -2469,7 +2469,7 @@ halmac_parse_psd_data_88xx(struct halmac_adapter *halmac_adapter, u8 *c2h_buf,
 	if (!psd_set->data) {
 		psd_set->data = kzalloc(psd_set->data_size, GFP_KERNEL);
 		if (!psd_set->data)
-			return HALMAC_CMD_PROCESS_ERROR;
+			return HALMAC_RET_MALLOC_FAIL;
 	}
 
 	if (segment_id == 0)