ext4: fix build warning
ext4: fix build warning

Replace `if' with `goto' to assure gcc that ix has been initialized.

Signed-off-by: Wu Fengguang <f25caf39e3e90f2a28a0f6211af92081109b663e@linux.intel.com>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs