drivers/staging/lustre: Nuke an unsigned >= 0 assert

drivers/staging/lustre: Nuke an unsigned >= 0 assert

Writing asserts for almost-never-can-happen things can be valuable.
Writing an assert that tests that an "unsigned int" hasn't gone negative
isn't.

And it generates an *ugly* message:

drivers/staging/lustre/lustre/llite/rw.c:763:20: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
  LASSERTF(reserved >= 0, "reserved %lu\n", reserved);
                    ^
include/linux/compiler.h:137:45: note: in definition of macro 'unlikely'
 #  define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
                                             ^
drivers/staging/lustre/lustre/llite/rw.c:763:2: note: in expansion of macro 'LASSERTF'
  LASSERTF(reserved >= 0, "reserved %lu\n", reserved);
  ^
drivers/staging/lustre/lustre/llite/rw.c:763:20: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
  LASSERTF(reserved >= 0, "reserved %lu\n", reserved);
                    ^
include/linux/compiler.h:137:53: note: in definition of macro 'unlikely'
 #  define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
                                                     ^
drivers/staging/lustre/lustre/llite/rw.c:763:2: note: in expansion of macro 'LASSERTF'
  LASSERTF(reserved >= 0, "reserved %lu\n", reserved);
  ^
drivers/staging/lustre/lustre/llite/rw.c:763:20: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
  LASSERTF(reserved >= 0, "reserved %lu\n", reserved);
                    ^
include/linux/compiler.h:110:47: note: in definition of macro 'likely_notrace'
 #define likely_notrace(x) __builtin_expect(!!(x), 1)
                                               ^
include/linux/compiler.h:137:58: note: in expansion of macro '__branch_check__'
 #  define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
                                                          ^
drivers/staging/lustre/lustre/llite/../include/linux/../../../include/linux/libcfs/libcfs_private.h:58:6: note: in expansion of macro 'unlikely'
  if (unlikely(!(cond))) {     \
      ^
drivers/staging/lustre/lustre/llite/rw.c:763:2: note: in expansion of macro 'LASSERTF'
  LASSERTF(reserved >= 0, "reserved %lu\n", reserved);
  ^

Umm, thank you, GCC.  We'll delete the problem line so we never see that spew again.

Signed-off-by: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>