linearToLogScale() - Input validation

[zonkmachine]

linearToLogScale() seem to be called only in AutomatableModel::inverseScaledValue() and I don't know what possible issues could come from this. Binding the input value to the max/min values seem like the way to go and pleases the fpe check.

Crash with fpe debug option when opening an LADSPA gui.

Program received signal SIGFPE, Arithmetic exception.
0x00007ffff459893f in __ieee754_powf (x=x@entry=-0,00100100099, y=y@entry=0,36787945) at ../sysdeps/ieee754/flt-32/e_powf.c:125
125	../sysdeps/ieee754/flt-32/e_powf.c: No such file or directory.
(gdb) bt full
#0  0x00007ffff459893f in __ieee754_powf (x=x@entry=-0,00100100099, y=y@entry=0,36787945) at ../sysdeps/ieee754/flt-32/e_powf.c:125
        z = <optimized out>
        ax = <optimized out>
...
        iy = 1052531378
        is = <optimized out>
#1  0x00007ffff459d1db in __powf (x=-0,00100100099, y=0,36787945) at w_powf.c:27
        z = <optimized out>
#2  0x00000000004f0954 in linearToLogScale (min=1, max=1000, value=0) at /home/zonkmachine/builds/lmms/lmms/include/lmms_math.h:222
        EXP = 0,36787945
        val = -0,00100100099
        result = 0
#3  0x00000000004f19cb in AutomatableModel::inverseScaledValue (this=0x1924cc0, value=0)
    at /home/zonkmachine/builds/lmms/lmms/src/core/AutomatableModel.cpp:271
No locals.