[Wien] warning message for a few c files under SRC_aim folder

[Yundi Quan]

Hi, Sir/Madam,
I compiled WIEN2k_13 using intel compiler 2013 (composerxe-2011.3.174) with
 -O3 optimization and got the following warning:
d1mach.c(35): warning #1011: missing return statement at end of non-void
function "i1mach"
  }
  ^

d1mach.c(54): warning #1011: missing return statement at end of non-void
function "d1mach"
     }
     ^

d1mach.c(74): warning #1011: missing return statement at end of non-void
function "r1mach"
     }

Are these warnings important?
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