ufs: ti-j721e: Correct error detection

In ti_j721e_ufs_probe there is a call to clk_get_rate but the code after
that attempts to detect an error from that call incorrectly uses
IS_ERR_VALUE.  Instead the test should just be for regular error codes.
The call returns an unsigned long so that needs to be cast to a signed type
first of all.

This issue was found by Smatch.

Signed-off-by: Andrew Goodbody <[email protected]>
Reviewed-by: Anshul Dalal <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Neil Armstrong <[email protected]>

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