regulator: core: fix resource leak in regulator_register()

In the Linux kernel, the following vulnerability has been resolved:

regulator: core: fix resource leak in regulator_register()

I got some resource leak reports while doing fault injection test:

OF: ERROR: memory leak, expected refcount 1 instead of 100,

of_node_get()/of_node_put() unbalanced - destroy cset entry:

attach overlay node /i2c/pmic@64/regulators/buck1

unreferenced object 0xffff88810deea000 (size 512):

comm "490-i2c-rt5190a", pid 253, jiffies 4294859840 (age 5061.046s)

hex dump (first 32 bytes):

00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........

ff ff ff ff ff ff ff ff a0 1e 00 a1 ff ff ff ff ................

backtrace:

[<00000000d78541e2>] kmalloc_trace+0x21/0x110

[<00000000b343d153>] device_private_init+0x32/0xd0

[<00000000be1f0c70>] device_add+0xb2d/0x1030

[<00000000e3e6344d>] regulator_register+0xaf2/0x12a0

[<00000000e2f5e754>] devm_regulator_register+0x57/0xb0

[<000000008b898197>] rt5190a_probe+0x52a/0x861 [rt5190a_regulator]

unreferenced object 0xffff88810b617b80 (size 32):

comm "490-i2c-rt5190a", pid 253, jiffies 4294859904 (age 5060.983s)

hex dump (first 32 bytes):

72 65 67 75 6c 61 74 6f 72 2e 32 38 36 38 2d 53 regulator.2868-S

55 50 50 4c 59 00 ff ff 29 00 00 00 2b 00 00 00 UPPLY...)...+...

backtrace:

[<000000009da9280d>] __kmalloc_node_track_caller+0x44/0x1b0

[<0000000025c6a4e5>] kstrdup+0x3a/0x70

[<00000000790efb69>] create_regulator+0xc0/0x4e0

[<0000000005ed203a>] regulator_resolve_supply+0x2d4/0x440

[<0000000045796214>] regulator_register+0x10b3/0x12a0

[<00000000e2f5e754>] devm_regulator_register+0x57/0xb0

[<000000008b898197>] rt5190a_probe+0x52a/0x861 [rt5190a_regulator]

After calling regulator_resolve_supply(), the 'rdev->supply' is set

by set_supply(), after this set, in the error path, the resources

need be released, so call regulator_put() to avoid the leaks.