Simplifies the code. Found by cocci:
drivers/media/common/saa7146/saa7146_hlp.c:125:36-37: WARNING opportunity for min()
drivers/media/common/saa7146/saa7146_hlp.c:154:41-42: WARNING opportunity for min()
drivers/media/common/saa7146/saa7146_hlp.c:286:35-36: WARNING opportunity for min()
drivers/media/common/saa7146/saa7146_hlp.c:289:35-36: WARNING opportunity for min()
Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>