Remove exra whitespace from files (#189)

* Remove multiple newlines at the end of files
* Remove the whitespace from the end of lines

drivers/bch/Make.defs

@@ -48,4 +48,3 @@ VPATH += :bch
 CFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" $(TOPDIR)$(DELIM)drivers$(DELIM)bch}
 
 endif
-

drivers/bch/bchlib_cache.c

@@ -198,4 +198,3 @@ int bchlib_readsector(FAR struct bchlib_s *bch, size_t sector)
 
   return (int)ret;
 }
-

drivers/bch/bchlib_teardown.c

@@ -94,4 +94,3 @@ int bchlib_teardown(FAR void *handle)
   kmm_free(bch);
   return OK;
 }
-

drivers/bch/bchlib_write.c

@@ -195,4 +195,3 @@ ssize_t bchlib_write(FAR void *handle, FAR const char *buffer, size_t offset,
 
   return byteswritten;
 }
-