s390/cpum_sf: Remove unnecessary check for pending SDBs
In interrupt handling the function extend_sampling_buffer() is called after checking for a possibly extension. This check is not necessary as the called function itself performs this check again. Signed-off-by: NThomas Richter <tmricht@linux.ibm.com> Signed-off-by: NVasily Gorbik <gor@linux.ibm.com>
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