crypto: qcom-rng - fix infinite loop on requests not multiple of WORD_SZ

The commit referenced in the Fixes tag removed the 'break' from the else
branch in qcom_rng_read(), causing an infinite loop whenever 'max' is
not a multiple of WORD_SZ. This can be reproduced e.g. by running:

kcapi-rng -b 67 >/dev/null

There are many ways to fix this without adding back the 'break', but
they all seem more awkward than simply adding it back, so do just that.

Tested on a machine with Qualcomm Amberwing processor.

Fixes: a680b1832ced ("crypto: qcom-rng - ensure buffer for generate is completely filled")
Cc: [e-mail]
Signed-off-by: Ondrej Mosnacek <[e-mail]>
Reviewed-by: Brian Masney <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/qcom-rng.c

···
 		} else {
 			/* copy only remaining bytes */
 			memcpy(data, &val, max - currsize);
+			break;
 		}
 	} while (currsize < max);