MAINTAINERS: comment out blank M: field

Since commit ddaf5c8f
(patman: RunPipe() should not pipe stdout/stderr unless asked),
Patman spits lots of "Invalid MAINTAINERS address: '-'"
error messages for patches with global changes.
It takes too long for Patman to process them.

Anyway, "M:    -" does not carry any important information.
Rather, it is just like a place holder in case of assigning
a new board maintainer.  Let's comment out.

This commit can be reproduced by the following command:

find . -name MAINTAINERS | xargs sed -i -e '/^M:[[:blank:]]*-$/s/^/#/'

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

board/LaCie/net2big_v2/MAINTAINERS

 NET2BIG_V2 BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/LaCie/net2big_v2/
 F:	include/configs/lacie_kw.h

board/LaCie/netspace_v2/MAINTAINERS

@@ -8,7 +8,7 @@ F:	configs/netspace_max_v2_defconfig
 F:	configs/netspace_v2_defconfig
 
 NETSPACE_LITE_V2 BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	configs/netspace_lite_v2_defconfig
 F:	configs/netspace_mini_v2_defconfig

board/LaCie/wireless_space/MAINTAINERS

 WIRELESS_SPACE BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/LaCie/wireless_space/
 F:	include/configs/wireless_space.h

board/Marvell/db64360/MAINTAINERS

 DB64360 BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/Marvell/db64360/
 F:	include/configs/DB64360.h

board/Marvell/db64460/MAINTAINERS

 DB64460 BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/Marvell/db64460/
 F:	include/configs/DB64460.h

board/Marvell/openrd/MAINTAINERS

@@ -6,7 +6,7 @@ F:	include/configs/openrd.h
 F:	configs/openrd_base_defconfig
 
 OPENRD_CLIENT BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	configs/openrd_client_defconfig
 F:	configs/openrd_ultimate_defconfig

board/a3000/MAINTAINERS

 A3000 BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/a3000/
 F:	include/configs/A3000.h

board/amcc/bubinga/MAINTAINERS

 BUBINGA BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/amcc/bubinga/
 F:	include/configs/bubinga.h

board/amcc/yucca/MAINTAINERS

 YUCCA BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/amcc/yucca/
 F:	include/configs/yucca.h

board/armltd/versatile/MAINTAINERS

 VERSATILE BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/armltd/versatile/
 F:	include/configs/versatile.h

board/armltd/vexpress/MAINTAINERS

 VEXPRESS BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/armltd/vexpress/
 F:	include/configs/vexpress_ca15_tc2.h

board/bc3450/MAINTAINERS

 BC3450 BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/bc3450/
 F:	include/configs/BC3450.h

board/canmb/MAINTAINERS

 CANMB BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/canmb/
 F:	include/configs/canmb.h

board/cm41xx/MAINTAINERS

 CM41XX BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/cm41xx/
 F:	include/configs/cm41xx.h

board/cm5200/MAINTAINERS

 CM5200 BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/cm5200/
 F:	include/configs/cm5200.h

board/cmi/MAINTAINERS

 CMI BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/cmi/
 F:	include/configs/cmi_mpc5xx.h

board/cobra5272/MAINTAINERS

 COBRA5272 BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/cobra5272/
 F:	include/configs/cobra5272.h

board/cpu87/MAINTAINERS

 CPU87 BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/cpu87/
 F:	include/configs/CPU87.h

board/dave/PPChameleonEVB/MAINTAINERS

 PPCHAMELEONEVB BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/dave/PPChameleonEVB/
 F:	include/configs/CATcenter.h

board/davinci/dvevm/MAINTAINERS

 DVEVM BOARD
-M:	-
+#M:	-
 S:	Maintained
 F:	board/davinci/dvevm/
 F:	include/configs/davinci_dvevm.h