kernel/range.c: subtract_range: fix the broken phrase issued by printk

Also replace deprecated printk(KERN_ERR...) with pr_err() as suggested
by Yinghai, attaching the function name to provide plenty info.
Signed-off-by: NLin Feng <linfeng@cn.fujitsu.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

kernel/range.c

@@ -97,7 +97,8 @@ void subtract_range(struct range *range, int az, u64 start, u64 end)
 				range[i].end = range[j].end;
 				range[i].start = end;
 			} else {
-				printk(KERN_ERR "run of slot in ranges\n");
+				pr_err("%s: run out of slot in ranges\n",
+					__func__);
 			}
 			range[j].end = start;
 			continue;