irqchip/gic-v3-its: Silence warning when its_lpi_alloc_chunks gets inlined
irqchip/gic-v3-its: Silence warning when its_lpi_alloc_chunks gets inlined

More agressive inlining in recent versions of GCC have uncovered
a new set of warnings:

 drivers/irqchip/irq-gic-v3-its.c: In function its_msi_prepare:
  drivers/irqchip/irq-gic-v3-its.c:1148:26: warning: lpi_base may be used
    uninitialized in this function [-Wmaybe-uninitialized]
     dev->event_map.lpi_base = lpi_base;
                          ^
 drivers/irqchip/irq-gic-v3-its.c:1116:6: note: lpi_base was declared here
  int lpi_base;
	      ^
 drivers/irqchip/irq-gic-v3-its.c:1149:25: warning: nr_lpis may be used
  uninitialized in this function [-Wmaybe-uninitialized]
   dev->event_map.nr_lpis = nr_lpis;
	                         ^
 drivers/irqchip/irq-gic-v3-its.c:1117:6: note: nr_lpis was declared here
  int nr_lpis;
	      ^
The warning is fairly benign (there is no code path that could
actually use uninitialized variables), but let's silence it anyway
by zeroing the variables on the error path.

Reported-by: Alex Shi <1abc5746028550adcf7742cb5d47df86766285d8@linaro.org>
Tested-by: Ard Biesheuvel <66d3c5fdaeea7ff1f996ad04f2c45e08ab38e2f5@linaro.org>
Signed-off-by: Marc Zyngier <a16cc0c82647c52d401177f8e50567df5499e36c@arm.com>
Cc: f99ef57ccac738b558d0fc2e44478b3c5def9522@lists.infradead.org
Cc: David Daney <1d8a6ccc3596121ad6db8988061b5cda25ecdfb1@gmail.com>
Cc: Jason Cooper <68c46a606457643eab92053c1c05574abb26f861@lakedaemon.net>
Link: http://lkml.kernel.org/r/1443800646-8074-2-git-send-email-a16cc0c82647c52d401177f8e50567df5499e36c@arm.com
Signed-off-by: Thomas Gleixner <00e4cf8f46a57000a44449bf9dd8cbbcc209fd2a@linutronix.de>

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