FASTBOOT: Remove unneeded strlen from fastboot_flash_find_ptn()

I don't know why someone thought strcmp() would return matches on
substrings; maybe they were confused by strncmp().

Change-Id: I00bf85c3989a8a26bbce6e5df32d37382ff7c98b
Signed-off-by: Scott Anderson <saa@google.com>
1 file changed