tree-wide: remove trailing backslash

Simple search for a backslash followed by two newlines.
If one of the newlines were to be removed, this would cause issues, so
let's just remove these trailing backslashes.

Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/intel/compiler/brw_inst.h

@@ -88,7 +88,7 @@ brw_inst_##name(const struct gen_device_info *devinfo,        \
    } else {                                                                  \
       high = hi4;  low = lo4;                                                \
    }                                                                         \
-   assert(((int) high) != -1 && ((int) low) != -1);                          \
+   assert(((int) high) != -1 && ((int) low) != -1);
 
 /* A general macro for cases where the field has moved to several different
  * bit locations across generations.  GCC appears to combine cases where the