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filp_close is using !file_count(filp) to check if f_count is 0. if it is
0, filp_close think it is a closed file then will return. However, for a
closed file, f_count could be reduced to -1, then !file_count(filp) is
false, filp_close will proceed to handle this file then could panic.
This change will check if f_count is 0 or negative instead of only
checking 0 to avoid panic.

b/18200219 LRX21M: kernel_panic
Change-Id: I3881574d4971bf4e0bc261cf3459451600ce6a27
Signed-off-by: Shengzhe Zhao <a18689@motorola.com>
Reviewed-by: Yi-Wei Zhao <gbjc64@motorola.com>
Signed-off-by: Iliyan Malchev <malchev@google.com>
(cherry picked from commit 7e67f8fa3981561e3d614f208cfedfc508a36a27)

Change-Id: I2d41ef53f128d842bee61123bf3a96144e92e953