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Function nvmem_reg_read can return a non zero value indicating an error. This returned value must be read and error propagated to nvmem_cell_prepare_write_buffer. Silence the following gcc warning (W=1): drivers/nvmem/core.c:1093:9: warning: variable 'rc' set but not used [-Wunused-but-set-variable] Signed-off-by: Mathieu Malaterre <[email protected]> Signed-off-by: Srinivas Kandagatla <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>